WorldWideScience

Sample records for conveyors

  1. Conveyor performance impacts mine productivity

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-11-01

    Factors leading to optimum performance of conveyors and conveyor systems with maximum reliability and least downtime are discussed. These include proper management of drives and take-up, predictive maintenance and condition monitoring and use of outsourcing maintenance. Advance in drive and take-up technologies together with computer software and hardware developments will reduce personnel requirements associated with conveyors. 2 photos.

  2. CONVEYOR SYSTEM SAFETY ANALYSIS

    Energy Technology Data Exchange (ETDEWEB)

    M. Salem

    1995-06-23

    The purpose and objective of this analysis is to systematically identify and evaluate hazards related to the Yucca Mountain Project Exploratory Studies Facility (ESF) surface and subsurface conveyor system (for a list of conveyor subsystems see section 3). This process is an integral part of the systems engineering process; whereby safety is considered during planning, design, testing, and construction. A largely qualitative approach was used since a radiological System Safety Analysis is not required. The risk assessment in this analysis characterizes the accident scenarios associated with the conveyor structures/systems/components in terms of relative risk and includes recommendations for mitigating all identified risks. The priority for recommending and implementing mitigation control features is: (1) Incorporate measures to reduce risks and hazards into the structure/system/component (S/S/C) design, (2) add safety devices and capabilities to the designs that reduce risk, (3) provide devices that detect and warn personnel of hazardous conditions, and (4) develop procedures and conduct training to increase worker awareness of potential hazards, on methods to reduce exposure to hazards, and on the actions required to avoid accidents or correct hazardous conditions. The scope of this analysis is limited to the hazards related to the design of conveyor structures/systems/components (S/S/Cs) that occur during normal operation. Hazards occurring during assembly, test and maintenance or ''off normal'' operations have not been included in this analysis. Construction related work activities are specifically excluded per DOE Order 5481.1B section 4. c.

  3. Current conveyors variants, applications and hardware implementations

    CERN Document Server

    Senani, Raj; Singh, A K

    2015-01-01

    This book serves as a single-source reference to Current Conveyors and their use in modern Analog Circuit Design. The authors describe the various types of current conveyors discovered over the past 45 years, details of all currently available, off-the-shelf integrated circuit current conveyors, and implementations of current conveyors using other, off-the-shelf IC building blocks. Coverage includes prominent bipolar/CMOS/Bi-CMOS architectures of current conveyors, as well as all varieties of starting from third generation current conveyors to universal current conveyors, their implementations and applications. •Describes all commercially available off-the-shelf IC current conveyors, as well as hardware implementations of current conveyors using other off-the-shelf ICs; • Describes numerous variants of current conveyors evolved over the past forty five years; • Describes a number of Bipolar/CMOS/Bi-CMOS architectures of current conveyors, along with their characteristic features; • Includes a comprehe...

  4. Current Conveyor Equivalent Circuits

    Directory of Open Access Journals (Sweden)

    Tejmal S. Rathore

    2012-02-01

    Full Text Available An equivalence between a class of (current conveyor CC II+ and CC II- circuits is established. CC IIequivalent circuit uses one extra element. However, under certain condition, the extra element can be eliminated. As an illustration of the application of this equivalence, minimal first and second order all-pass filters are derived. Incertain cases, it is possible to compensate the effect of the input resistor of CC at port X. At the end, an open problem of realizing an Nth order (N > 2 minimal all-pass filter is stated.

  5. Adjoint Networks with Inverting and Noninverting Current Conveyors

    OpenAIRE

    J. Cajka; T. Dostal; Vrba, K.

    2000-01-01

    Four types of second-generation current conveyors are shown. The realisation of the above conveyors using differential voltage current conveyors (VDCC) is presented. Two examples illustrate the building of adjoint networks containing second-generation current conveyors.

  6. High-powered conveyor systems: long distance, downhill, open-pit, and high capacity conveyors

    Energy Technology Data Exchange (ETDEWEB)

    Pelzer, H.K.

    1978-01-01

    Paper indicates the conditions under which belt conveyors are superior to other forms of transport, the limitations of these conveyors. Long distance, downhill, open-pit and high capacity conveyor installations are described, including a 60-mile long conveyor in the Sahara.

  7. A Chaos Conveyor Belt

    Science.gov (United States)

    Schmidt, Britney E.

    2013-10-01

    ocean in light of active processes that may form a “chaos conveyor belt” that drives material exchange on Europa.

  8. Noise Properties of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1996-01-01

    The definition of the current conveyor is presented and it is shown how different generations of current conveyors can all be combined into a single definition of a multiple-output second generation current conveyor (CCII). Next, noise sources are introduced into the model, and a general noise...... model for the current conveyor is established. This model is used for the analysis of selected examples of current conveyor based operational amplifier configurations and the relative merits with respect to the noise performance of these configurations are discussed. Finally, the noise model...... is developed for a CMOS current conveyor implementation, and optimization strategies for noise reduction are discussed. It is concluded that a class AB implementation provides more flexibility than does a class A configuration. In both cases it is essential to design low noise current mirrors and current...

  9. Chaos on the conveyor belt

    CERN Document Server

    Sándor, Bulcsú; Tél, Tamás; Néda, Zoltán

    2013-01-01

    The dynamics of a spring-block train placed on a moving conveyor belt is investigated both by simple experiments and computer simulations. The first block is connected by spring to an external static point, and due to the dragging effect of the belt the blocks undergo complex stick-slip dynamics. A qualitative agreement with the experimental results can only be achieved by taking into account the spatial inhomogeneity of the friction force on the belt's surface, modeled as noise. As a function of the velocity of the conveyor belt and the noise strength, the system exhibits complex, self-organized critical, sometimes chaotic dynamics and phase transition-like behavior. Noise induced chaos and intermittency is also observed. Simulations suggest that the maximum complexity of the dynamical states is achieved for a relatively small number of blocks, around five.

  10. Dynamic characteristics of conveyor belts

    Institute of Scientific and Technical Information of China (English)

    HOU You-fu; MENG Qing-rui

    2008-01-01

    The dynamic characteristics of a belt conveyor are determined to a large extent by the properties of the belt. This paper describes experiments designed to establish the dynamic properties of belting material. The dynamic elastic modulus, viscous damping and theological constants of the belt were measured. Several properties were studied as a function of the tensile loading on the belt. These included longitudinal vibration, the natural vibration frequency in the transverse direction and the response to an impulse excitation. Vibration response was observed under several different excitation frequencies. Most of these properties have not been tested previously under conditions appropriate for the ISO/DP9856 standard. Two types of belt were tested, a steel reinforced belt and a fabric reinforced belt. The test equipment was built to provide data appropriate for designing belt conveyors. It was observed that the stress wave propagation speed increased with tensile load and that tensile load was the main factor influencing longitudinal vibrations.

  11. Adjoint Networks with Inverting and Noninverting Current Conveyors

    Directory of Open Access Journals (Sweden)

    J. Cajka

    2000-04-01

    Full Text Available Four types of second-generation current conveyors are shown. Therealisation of the above conveyors using differential voltage currentconveyors (VDCC is presented. Two examples illustrate the building ofadjoint networks containing second-generation current conveyors.

  12. Computer-aided design of conveyor belts

    Energy Technology Data Exchange (ETDEWEB)

    Karolewski, B.; Pytel, J.

    1984-01-01

    Possibilities are discussed for using mathematical models of belt conveyors for development of computer-aided design of conveyors for coal mining. Examples of optimization tasks and methods for their solution using computerized simulation are analyzed. The analysis is illustrated by an algorithm used to design a starter for the drive system of a belt conveyor. Electromagnetic moment and starting current are used as optimization criteria. A simplified model of a belt conveyor is used. The model consists of an equation of motion with variable braking moment and variable moment of inertia. 3 references.

  13. Nodal Analysis of Circuits Containing Current Conveyors

    OpenAIRE

    T. Dostal; A. I. Rybin

    2001-01-01

    A special method of the nodal analysis of the circuits containing several types of the multiport current conveyors is presented in this paper. The method is based on the given regular and homogeneous models of the irregular current conveyors by the gyrators. Then a diakoptic solving and modification of the inversion of the admittance matrix is applied

  14. Nodal Analysis of Circuits Containing Current Conveyors

    Directory of Open Access Journals (Sweden)

    T. Dostal

    2001-09-01

    Full Text Available A special method of the nodal analysis of the circuits containingseveral types of the multiport current conveyors is presented in thispaper. The method is based on the given regular and homogeneous modelsof the irregular current conveyors by the gyrators. Then a diakopticsolving and modification of the inversion of the admittance matrix isapplied

  15. Intelligent Belt Conveyor Monitoring and Control

    NARCIS (Netherlands)

    Pang, Y.

    2010-01-01

    Belt conveyors have been used worldwide in continuous material transport for about 250 years. Traditional inspection and monitoring of large-scale belt conveyors focus on individual critical components and response to catastrophic system failures. To prevent operational problems caused by the lack

  16. Intelligent Belt Conveyor Monitoring and Control

    NARCIS (Netherlands)

    Pang, Y.

    2010-01-01

    Belt conveyors have been used worldwide in continuous material transport for about 250 years. Traditional inspection and monitoring of large-scale belt conveyors focus on individual critical components and response to catastrophic system failures. To prevent operational problems caused by the lack o

  17. AUTOMATION OF CONVEYOR BELT TRANSPORT

    Directory of Open Access Journals (Sweden)

    Nenad Marinović

    1990-12-01

    Full Text Available Belt conveyor transport, although one of the most economical mining transport system, introduce many problems to mantain the continuity of the operation. Every stop causes economical loses. Optimal operation require correct tension of the belt, correct belt position and velocity and faultless rolls, which are together input conditions for automation. Detection and position selection of the faults are essential for safety to eliminate fire hazard and for efficient maintenance. Detection and location of idler roll faults are still open problem and up to now not solved successfully (the paper is published in Croatian.

  18. EVALUATION OF SOME PRODUCTION CHARACTERISTICS OF RECURSIVE CONVEYOR

    Directory of Open Access Journals (Sweden)

    Boris V. Kupriyanov

    2016-01-01

    Full Text Available We consider the two objectives of direct relevance to operational planning based on the model of recursive conveyor process. Calculate the Critical Operation of the conveyor and calculate the Load Factor of the equipment of the conveyor

  19. Development of belt conveyor driving system

    Institute of Scientific and Technical Information of China (English)

    FU Jun-qing(付峻青); WANG Cong(王聪); HUO Wei(霍伟)

    2004-01-01

    A short review for the existing various driving methods for belt conveyor was given, which include the analysis and comparison about the advantages, disadvantages and suitable application range of these methods. Based on this the variable-frequency-control(VFC) method for belt conveyor drive was fully discussed with focus on its application in medium-high voltage range. The principle of Neutral Point Clamped (NPC) Three-Level Inverter using high-voltage IGBTs together with the control strategy of rotor field-oriented vector control for induction motor drive were illustrated.

  20. Floating RC Networks Using Current Conveyors

    OpenAIRE

    Zeman, V; J. Cajka; Vrba, K.

    1996-01-01

    The paper deals with the design of floating one- and/or two-port high-order networks. The current conveyor CCII+ seems to be a suitable active building block for this purpose. Some examples of the above mentioned networks are shown .

  1. Floating RC Networks Using Current Conveyors

    Directory of Open Access Journals (Sweden)

    V. Zeman

    1996-06-01

    Full Text Available The paper deals with the design of floating one- and/or two-port high-order networks. The current conveyor CCII+ seems to be a suitable active building block for this purpose. Some examples of the above mentioned networks are shown .

  2. Design aspects of multiple driven belt conveyors

    NARCIS (Netherlands)

    Nuttall, A.J.G.

    2007-01-01

    Worldwide belt conveyors are used to transport a great variety of bulk solid materials. The desire to carry higher tonnages over longer distances and more diverse routes, while keeping exploitation costs as low as possible, has fuelled many technological advances. An interesting development in the r

  3. Design aspects of multiple driven belt conveyors

    NARCIS (Netherlands)

    Nuttall, A.J.G.

    2007-01-01

    Worldwide belt conveyors are used to transport a great variety of bulk solid materials. The desire to carry higher tonnages over longer distances and more diverse routes, while keeping exploitation costs as low as possible, has fuelled many technological advances. An interesting development in the

  4. Communication equipment for underground conveyor units

    Energy Technology Data Exchange (ETDEWEB)

    Geurts, J.

    1981-06-01

    There are many factors governing smooth operation of a conveyor system. Communication systems are required for fast access to information in case of disturbances. The following possibilities are reported: Use of the existing telecommunication network, use of radio equipment, use of an independent intercommunication system.

  5. Analysis of the Noise Characteristics of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1997-01-01

    The definition of the current conveyor is reviewed and a multiple-output second generation current conveyor (CCII) is shown to combine the different generations of current conveyors presently existing. Next, noise sources are introduced, and a general noise model for the current conveyor...... is described. This model is used for the analysis of selected examples of current conveyor based operational amplifier configurations and the noise performance of these configurations is compared. Finally, the noise model is developed for a CMOS current conveyor implementation, and approaches...... to an optimization of the noise performance are discussed. It is concluded that a class AB implementation can yield a lower noise output for the same dynamic range than a class A implementation. For both the class A implementation and the class AB implementation it is essential to design low noise current mirrors...

  6. Conveyor haulage systems: new design trends and ideas

    Energy Technology Data Exchange (ETDEWEB)

    Glossop, M.

    1983-06-01

    Extended use of belt conveyors for overland haulage has followed the continuing development of conveyor belting. Development of belt jointing techniques, the extended use of steel as a tension member, and the use of high-grade man-made fibres, such as Kevlar, has resulted in reliable high strength belts. The conveyor engineer's attention is now concerned more with problems of control. Use of multi-motor drives has brought the need for closed control of power sharing between drives. One recent development in this field is the Dowty Meco Power Monitoring Control System which provides a means of controlling acceleration and deceleration of a belt conveyor. A system of this kind is particularly valuable in controlling conveyors on gradients. Use of multiple drive motors is also pertinent where the load to be carried by the conveying system is expected to vary. Recently, further attention has been given to the requirements for longer length curved conveyors.

  7. Current Conveyor Based Window Comparator Circuits

    Directory of Open Access Journals (Sweden)

    Sudhanshu Maheshwari

    2016-01-01

    Full Text Available This paper introduces a new window comparator circuit utilizing a new current conveyor and two diodes, operable at ±1.25 V and capable of accurately detecting the voltage windows. Another modified circuit with distinct binary levels suited for automatic control applications is also suggested. Exhaustive simulation results showing detection of windows, as small as 50 mV and as high as 1 V, are included. Comparisons are further drawn with the traditional operational amplifier based circuit and the new circuit is found to benefit from the use of current-mode active element, namely, Extra-X Current Controlled Current Conveyor. The proposed theory is well supported through simulation results.

  8. Underground fires involving conveyor systems, 1958-78

    Energy Technology Data Exchange (ETDEWEB)

    Cutler, D.P.; Currie, J.L.

    1979-12-01

    Discusses the emergence of fire resistant conveyor belts for use in British mines, following the fires at Creswell and Whitfield Collieries, and the development of fire tests. The principle tests for belting are described and their relevance to the real fire situation is shown. The role of the conveyor as a cause of fire, and the effects of fire on conveyors, are identified from the fire statistics for the past 21 years.

  9. Resistance and other parameters of belt conveyor shifting

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1988-07-01

    Discusses a method developed by Poltegor for calculating energy consumption of belt conveyor shifting in brown coal surface mines in Poland. A program for simulating effects of all significant factors that represent the environment, physical and mechanical properties of soil, effects of weather and atmospheric precipitations, design of belt conveyors, effects of soil or coal buildup and conveyor wear is used. Indices that describe effects of major groups of factors are used for calculating resistance to belt conveyor shifting considering local conditions. Investigations carried out in the Belchatow brown coal mine show the method to be accurate and reliable.

  10. Universal Voltage Conveyor and Current Conveyor in Fast Full-Wave Rectifier

    Directory of Open Access Journals (Sweden)

    Josef Burian

    2012-12-01

    Full Text Available This paper deals about the design of a fast voltage-mode full-wave rectifier, where universal voltage conveyor and second-generation current conveyor are used as active elements. Thanks to the active elements, the input and output impedance of the non-linear circuit is infinitely high respectively zero in theory. For the rectification only two diodes and three resistors are required as passive elements. The performance of the circuit is shown on experimental measurement results showing the dynamic range, time response, frequency dependent DC transient value and RMS error for different values of input voltage amplitudes.

  11. THE TRANSFORMATION OF THE RECURSIVE CONVEYOR FROM THE GENERAL FORM TO THE LINEAR CONVEYOR

    Directory of Open Access Journals (Sweden)

    Boris V. Kupriyanov

    2015-01-01

    Full Text Available We consider the problem of converting the model of the recursive conveyor process with a variable performance and characterized by five parameters in the model with a constant performance. The resulting process is characterized by only the initial phase and conveying performance. 

  12. A Novel Ideal Floating Inductor Using Translinear Conveyors

    Directory of Open Access Journals (Sweden)

    Iqbal A. Khan

    2003-01-01

    Full Text Available An ideal floating inductor circuit using translinear conveyors is introduced. The floating inductor simulator uses two translinear conveyors and a single capacitor in its realization. The circuit provides the current controlled ideal floating inductance without any component matching constraints. Simulation results on the floating inductor simulator verify the theory

  13. Emulation of floating memcapacitors and meminductors using current conveyors

    OpenAIRE

    Pershin, Yuriy V.; Di Ventra, Massimiliano

    2010-01-01

    We suggest circuit realizations of emulators transforming memristive devices into effective floating memcapacitive and meminductive systems. The emulator's circuits are based on second generation current conveyors and involve either four single-output or two dual-output current conveyors. The equations governing the resulting memcapactive and meminductive systems are presented.

  14. 30 CFR 56.14202 - Manual cleaning of conveyor pulleys.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Manual cleaning of conveyor pulleys. 56.14202 Section 56.14202 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND... Equipment Safety Practices and Operational Procedures § 56.14202 Manual cleaning of conveyor...

  15. Behind KPC's 13 km conveyor

    Energy Technology Data Exchange (ETDEWEB)

    James, G. (Minenco Pty. Ltd., Brisbane, Qld. (Australia))

    1993-11-01

    Describes the Kaltim Prima Coal overland conveyor. The conveyor is 13.1 km long and runs from the mine to a 700,000 port stockpile. Aspects covered include design and construction, instrumentation, equipment selection and discharge chutework. 1 fig., 1 photo.

  16. Emulation of floating memcapacitors and meminductors using current conveyors

    CERN Document Server

    Pershin, Yuriy V

    2010-01-01

    We suggest circuit realizations of emulators transforming memristive devices into effective floating memcapacitive and meminductive systems. The emulator's circuits are based on second generation current conveyors and involve either four single-output or two dual-output current conveyors. The equations governing the resulting memcapactive and meminductive systems are presented.

  17. Reducing The Risk Of Fires In Conveyor Transport

    Science.gov (United States)

    Cheremushkina, M. S.; Poddubniy, D. A.

    2017-01-01

    The paper deals with the actual problem of increasing the safety of operation of belt conveyors in mines. Was developed the control algorithm that meets the technical requirements of the mine belt conveyors, reduces the risk of fires of conveyors belt, and enables energy and resource savings taking into account random sort of traffic. The most effective method of decision such tasks is the construction of control systems with the use of variable speed drives for asynchronous motors. Was designed the mathematical model of the system "variable speed multiengine drive - conveyor - control system of conveyors", that takes into account the dynamic processes occurring in the elements of the transport system, provides an assessment of the energy efficiency of application the developed algorithms, which allows to reduce the dynamic overload in the belt to (15-20)%.

  18. Heads for shifting new generation of belt conveyors

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1980-03-01

    New design of belt conveyors characterized by rigid section joints and conveyor to pontoon joints significantly influences loading of machines shifting belt conveyors to new locations. A new belt conveyor shifting machine head design, called SGP12 (selflocking head for vertical loads up to 120 kN) is described. Design is shown in 4 diagrams. It is stressed that in the SGP-12 the force clamping rollers on rails is automatically controlled depending on the height to which the rails are lifted. Clamping force is proportional to the height. This means of controlling the clamping force excludes damage to the head and reduces wear of the rollers. The SGP12 is, therefore, superior to the GP-12 shifting head of similar capacity. It is suggested that the SGP-12 is characterized by simple design, easier operation, higher reliability and greater safety. The SGP-12 can be used to shift belt conveyors with belts 2250 mm to 3000 mm wide.

  19. Linear Motor for Drive of Belt Conveyor

    Directory of Open Access Journals (Sweden)

    Milan Krasl

    2006-01-01

    Full Text Available This paper introduces a novel approach on the design of a linear motor for drive of belt conveyor (LMBC. The motor is a simple combination of asynchronous motor in plane. The electromagnetic forces is one of the most important parameters of electrical machines. This parameter is necessary for the checking of the design. This paper describes several variants: linear motor with slots in platens, slots in one half of platens and optimization of slots. The electromagnetic force can be found with the help of a Finite Elements Method – based program. For solution was used QuickField program.

  20. CALCULATION OF TENSION FORCE OF BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    Ismet Ibishi

    2012-12-01

    Full Text Available In this paper is done the explanation on tension fashion of the belt conveyor which is employed in Kosovo Energy Corporation – KEK, for coal transportation to provide electric power plant. The aim of the paper enables to recognize tension forces not to pass with deformation of belt so that this problem will damage the workingprocess. Work principle is based on initial tension and tension during working process. The fact is known that the tension starts from the carriage on the way to tension mechanization, so forces on the rope passing through pulley there has to dominate the friction coefficient. All this process is related to economy of transportationmechanism.

  1. Trial Application of Pulse-Field Magnetization to Magnetically Levitated Conveyor System

    Directory of Open Access Journals (Sweden)

    Yoshihito Miyatake

    2012-01-01

    Full Text Available Magnetically levitated conveyor system using superconductors is discussed. The system is composed of a levitated conveyor, magnetic rails, a linear induction motor, and some power supplies. In the paper, pulse-field magnetization is applied to the system. Then, the levitation height and the dynamics of the conveyor are controlled. The static and dynamic characteristics of the levitated conveyor are discussed.

  2. Optical Tomography Imaging in Pneumatic Conveyor

    Directory of Open Access Journals (Sweden)

    Ruzairi Abdul Rahim

    2008-08-01

    Full Text Available This paper describes the development of a tomographic system by employing optical sensors using low cost approach. The final aim of this project is achieving real-time monitoring of solid particles having low concentration flow when conveyed in vertical pneumatic conveyor. The developed tomography system consists of 32 pairs of Light Emitting Diode (LED and silicon PIN photodiode. These sensors are used to monitor the emitted radiation for fluctuations caused by particles interfering with the beam when passing through it. A good design of sensor fixture may increase the collimating of light beam from a light source that passes through a flow regime. The obtained information from sensors provided the cross-sectional material distribution in conveyor. By using this information, the relationships between particle distribution and light attenuation effects are investigated by using computer programming to reconstruct the image. The results obtained from this investigation shows that the low cost optical sensors are suitable for monitoring low and medium concentration flowing materials. Optical sensors provide an opportunity to design sensors with a very wide bandwidth, thus enabling the measurement of high speed flowing particles or droplets.

  3. Full-wave current conveyor precision rectifier

    Directory of Open Access Journals (Sweden)

    Đukić Slobodan R.

    2008-01-01

    Full Text Available A circuit that provides precision rectification of small signal with low temperature sensitivity for frequencies up to 100 kHz without waveform distortion is presented. It utilizes an improved second type current conveyor based on current-steering output stage and biased silicon diodes. The use of a DC current source to bias the rectifying diodes provides higher temperature stability and lower DC offset level at the output. Proposed design of the precision rectifier ensures good current transfer linearity in the range that satisfy class A of the amplifier and good voltage transfer characteristic for low level signals. Distortion during the zero crossing of the input signal is practically eliminated. Design of the proposed rectifier is realized with standard components.

  4. Floating Inductance and FDNR Using Positive Polarity Current Conveyors

    OpenAIRE

    Pal, K.

    2004-01-01

    A generalized circuit based on five positive polarity second-generation current conveyors is introduced. The circuit simulates a floating inductance, capacitor floatation circuit and floating fdnr. All these circuits use grounded capacitors.

  5. Centrifuging Step-Screw Conveyor for Regolith Project

    Data.gov (United States)

    National Aeronautics and Space Administration — A variety of ISRU operations will utilize lunar regolith as feedstock. The proposed centrifuging step-screw conveyor concept will provide a well controlled robust,...

  6. Floating Inductance and FDNR Using Positive Polarity Current Conveyors

    Directory of Open Access Journals (Sweden)

    K. Pal

    2004-01-01

    Full Text Available A generalized circuit based on five positive polarity second-generation current conveyors is introduced. The circuit simulates a floating inductance, capacitor floatation circuit and floating fdnr. All these circuits use grounded capacitors.

  7. LOAD DISTRIBUTION ON DRUMS OF DOUBLE DRIVE BELT CONVEYOR

    Institute of Scientific and Technical Information of China (English)

    薛河; 苏清祖; 马胜利

    1999-01-01

    The double drum drive is widely used on the mine belt conveyor, which are divided the rigid connected double drums and separately driving double drums according to connected method of two drums. Because of the change of real work condition, the load distribution is changed on the two drive drums, which may produce a slippage between a drum and belt. Slippage may intensify the wear of the drum, and sometimes causing the fire of the belt. This restricts the development toward narrow belt, high velocity and large power of belt conveyor. In this paper, the factors affecting the load distribution of two drums of double drum belt conveyor are'systematically analyzed and some computing formulas derived, by these formulas, the actual load distribution onthe two drums of rigid connected or separately driving belt conveyor can be separately calculated. These formulas also can be as the theory base for adjusting the driving force of two drums.

  8. A Review of Screw Conveyors Performance Evaluation During Handling Process

    Directory of Open Access Journals (Sweden)

    Hemad Zareiforoush

    2010-04-01

    Full Text Available This paper reviews recent work on screw conveyors performance evaluation during handling process, especially in the case of agricultural grains and bulk materials. Experimental work has been mainly carried out to determine a range of parameters, such as auger dimension, screw rotational speed, screw clearance, conveyor intake length and conveying angle for horizontal, inclined and vertical screw conveyors. Several measurement techniques including theoretical models and DEM have been utilized to study the screw conveyors performance. However, each of these techniques is limited in its application. Difficulties in representing vortex motion and interactions among conveying grains and between the particles and screw rotating flight have so far limited the success of advanced modeling. Further work is needed to be conducted on screw augers performance to understand and improve the agricultural grains and bulk materials handling process.

  9. design and implementation of conveyor line speed synchroniser for ...

    African Journals Online (AJOL)

    user

    2016-07-03

    Jul 3, 2016 ... The electrical and mechanical sections were modeled separately and then integrated to obtain one composite ... speed of action of other process machines results in ..... 3.1 Simulation Results of Dc Motor and Belt Conveyor.

  10. RECURSIVE CONVEYOR PROCESSES - THE MAIN PROPERTIES AND CHARACTERISTICS

    Directory of Open Access Journals (Sweden)

    Boris V. Kupriyanov

    2015-01-01

    Full Text Available In the article the formal model of recursive conveyor processes is considered. The main properties and characteristics ofthis type of processes are described andillustrated. Based on these properties splitting processes into classes is carried out.

  11. Electronically Tunable Quadrature Oscillator Using Translinear Conveyors and Grounded Capacitors

    OpenAIRE

    Sudhanshu Maheshwari

    2003-01-01

    A new electronically tunable current-mode sinusoidal oscillator with three quadrature outputs is presented. The proposed circuit employs three translinear conveyors and two grounded capacitors to realize three quadrature outputs with independent frequency control. The circuit requires no resistors and the frequency of the oscillator can be varied over a wide range by external current control. RSPICE simulation results using the bipolar implementation of translinear conveyors are given to s...

  12. Development of a high capacity longwall conveyor. Final technical report

    Energy Technology Data Exchange (ETDEWEB)

    Sparks, C

    1982-05-01

    The objectives of this program were to develop, fabricate, and demonstrate a longwall conveying system capable of transporting coal at a rate of 9000 tons/day (1000 tons/hr) and capable of accommodating a surge rate of 20 tons/min. The equipment was required to have the structural durability to perform with an operating availability of 90%. A review of available literature and discussions with longwall operators identified the problem areas of conveyor design that required attention. The conveyor under this contract was designed and fabricated with special attention given to these areas, and also to be easily maintainable. The design utilized twin 300 hp drives and twin inboard 26-mm chain at 270 ft/min; predictions of capacity and reliability based on the design indicating that it would satisfy the program requirements. Conveyor components were critically tested and the complete conveyor was surface-tested, the results verifying the design specifications. In addition, an instrumentation system was developed with analysis by computer techniques to monitor the performance of the conveyor. The conveyor was installed at a selected mine site, and it was the intention to monitor its performance over the entire longwall panel. Monitoring of the conveyor performance was conducted over approximately one-third of the longwall panel, at which point further effort was suspended. However, during the monitored period, data collected from various sources showed the conveyor to have exhibited its capability of transporting coal at the desired rate, and also to have conformed to the program requirements of reliability and availability.

  13. Development of a high capacity longwall conveyor. Final technical report

    Energy Technology Data Exchange (ETDEWEB)

    Sparks, C

    1982-05-01

    The objectives of this program were to develop, fabricate, and demonstrate a longwall conveying system capable of transporting coal at a rate of 9000 tons/day (1000 tons/hr) and capable of accommodating a surge rate of 20 tons/min. The equipment was required to have the structural durability to perform with an operating availability of 90%. A review of available literature and discussions with longwall operators identified the problem areas of conveyor design that required attention. The conveyor under this contract was designed and fabricated with special attention given to these areas, and also to be easily maintainable. The design utilized twin 300 hp drives and twin inboard 26-mm chain at 270 ft/min; predictions of capacity and reliability based on the design indicating that it would satisfy the program requirements. Conveyor components were critically tested and the complete conveyor was surface-tested, the results verifying the design specifications. In addition, an instrumentation system was developed with analysis by computer techniques to monitor the performance of the conveyor. The conveyor was installed at a selected mine site, and it was the intention to monitor its performance over the entire longwall panel. Monitoring of the conveyor performance was conducted over approximately one-third of the longwall panel, at which point further effort was suspended. However, during the monitored period, data collected from various sources showed the conveyor to have exhibited its capability of transporting coal at the desired rate, and also to have conformed to the program requirements of reliability and availability.

  14. MANAGEMENT OF TRAFFIC FLOW ON A CONVEYOR TRANSPORT

    Directory of Open Access Journals (Sweden)

    V. V. Tkachev

    2007-12-01

    Full Text Available The analysis of control capability of the freight traffic volumes in coal mines, which use storage bunkers for averaging a flow from the mining sections, is carried out on the basis of imitation model of conveyor network with the use of predistribution of conveyor space, on the base of equipment SAUKL for the purpose of stabilizing the freight traffic volume and avoiding the losses during transportation.

  15. Research on Dynamic Tension for Belt Conveyor with Constant Force Automatic Take-Up Assembly

    Institute of Scientific and Technical Information of China (English)

    MENG Guo-ying; CHEN Jing-li; LI Yu-jin

    2003-01-01

    The article Provides a dynamic model for belt conveyor. Based on the drive-force of conveyor, take-up tension of take-up assembly, gravity of conveyor belt and material, and friction between belt and idlers, it gives a viscoelastic dynamic equation for conveyor belt. It presents a calculation method of analytic solution to both viscoelastic dynamic equation and geometric dynamic equation when automatic take-up assembly is applied to belt conveyor. The article also makes a study of design method of limiting and eliminating the conveyor belt's elastic vibration.

  16. Discrete element modelling of screw conveyor-mixers

    Directory of Open Access Journals (Sweden)

    Jovanović Aca

    2015-01-01

    Full Text Available Screw conveyors are used extensively in food, plastics, mineral processing, agriculture and processing industries for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity in design, the transportation action is very complex for design and constructors have tended to rely heavily on empirical performance data. Screw conveyor performance is affected by its operating conditions (such as: the rotational speed of the screw, the inclination of the screw conveyor, and its volumetric fill level. In this paper, horizontal, several single-pitch screw conveyors with some geometry variations in screw blade was investigated for mixing action during transport, using Discrete Element Method (DEM. The influence of geometry modifications on the performance of screw conveyor was examined, different screw designs were compared, and the effects of geometrical variations on mixing performances during transport were explored. During the transport, the particle tumbles down from the top of the helix to the next free surface and that segment of the path was used for auxiliary mixing action. The particle path is dramatically increased with the addition of three complementary helices oriented in the same direction as screw blades (1458.2 mm compared to 397.6 mm in case of single flight screw conveyor Transport route enlarges to 1764.4 mm, when installing helices oriented in the opposite direction from screw blades. By addition of straight line blade to single flight screw conveyor, the longest particle path is being reached: 2061.6 mm [Projekat Ministarstva nauke Republike Srbije, br. TR-31055

  17. Transparent Conveyor of Dielectric Liquids or Particles

    Science.gov (United States)

    Calle, Carlos I.; Mantovani, James G.

    2009-01-01

    The concept of a transparent conveyor of small loose dielectric parti cles or small amounts of dielectric liquids has emerged as an outgro wth of an effort to develop efficient, reliable means of automated re moval of dust from solar cells and from windows of optical instrumen ts. This concept is based on the previously reported concept of an e lectrodynamic screen, according to which a grid-like electric field is established on and near a surface and is moved along the surface p erpendicularly to the grid lines. The resulting electrodynamic force s on loose dielectric particles or dielectric liquid drops in the vic inity would move the particles or drops along the surface. In the or iginal dust-removal application, dust particles would thus be swept out of the affected window area. Other potential applications may occ ur in nanotechnology -- for example, involving mixing of two or more fluids and/or nanoscale particles under optical illumination and/or optical observation.

  18. On possible flow back in vertical screw conveyors for cohesionless granular materials

    NARCIS (Netherlands)

    Rademacher, F.J.C.

    1981-01-01

    Conditions for which back flow will be initiated in vertical screw conveyors conveying cohesionless granular material are theoretically established. Use is made of existing knowledge of the performance characteristics of such conveyors. Provided the conveyor is operated at not too low an angular spe

  19. 7 CFR 58.228 - Dump hoppers, screens, mixers and conveyors.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Dump hoppers, screens, mixers and conveyors. 58.228... Service 1 Equipment and Utensils § 58.228 Dump hoppers, screens, mixers and conveyors. The product contact surfaces of dump hoppers, screens, mixers and conveyors which are used in the process of transferring...

  20. On Dynamic Range Limitations of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1999-01-01

    This paper is concerned with the dynamic range of continuous time CMOS current mode circuits. As a representative current mode device a class AB current conveyor is examined. First, the voltage input range of the high impedance Y input is investigated. Next, the current input range of the low...... frequency band and for the situation where the conveyor is used over the full bandwidth achievable. Finally, the optimisation of the current input range is related to the distortion characteristics and it is pointed out that to a first order approximation the distortion is independent of the current range....... impedance X input is investigated. It is compared to the thermal noise in the X to Z signal path in order to evaluate the dynamic range, and the dependencies of the dynamic range on the supply voltage and the transistor lay-out is derived, both for the situation where the conveyor is used over a narrow...

  1. RATIONALE FOR CENTERING CAPACITY OF REDISIGNED BELT CONVEYOR DRUMS

    Directory of Open Access Journals (Sweden)

    V. V. Suglobov

    2016-02-01

    Full Text Available Purpose. In the study is necessary: 1 to justify aligning drums of a new design of belt conveyors; 2 to develop a method for calculating and determining the rational design parameters of drums depending on the technical parameters of the conveyor belt (the length of the conveyor, belt width, the performance of the conveyor, the diameter of the drive and tension drums, etc.; 3 to carry out pilot studies of efficiency conveyor belt in a production environment in order to determine the magnitude of dynamic loads and a comparative evaluation of the effectiveness of the centering ability of conventional and new designs of drums. Methodology. To substantiate the effectiveness of the centering ability of the drums of a new design by the authors developed a mathematical model of interaction of the tape with the drum. Mathematical simulation of tape reels with new design comes to drawing up a differential equation of the belt based on the dynamic component and restoring force. This model allowed us to estimate the movement of the tape in the transverse direction based on the calculated additional dynamic loads and forces on the investigated centering a conveyor belt with given specifications. For the first time the technique of calculating and determining the rational parameters of the drums, which allows determining the design parameters of the centering portions, depending on the mechanical properties and geometric parameters of the tape. Findings. With the help of mathematical modeling the scientifically substantiated effect of centering the ability of the new design of the drum, which ensures stable tape running along the longitudinal axis of the conveyor. The authors made the following conclusions: 1 the mathematical model of interaction with the new belt design of the drum, which allowed to describe the belt in the transverse direction in view of additional dynamic loads and renewable power was developed; 2 the method of calculation and

  2. DEVELOPMENT OF THE TEST METHODS OF THE CONVEYOR BELTS USED IN ENVIRONMENTS ENDANGERED BY EXPLOSION HAZARDS

    Directory of Open Access Journals (Sweden)

    Florin Adrian PĂUN

    2012-05-01

    Full Text Available Conveyor belts are used for a long period of time in the industry branches where potentially explosive atmospheres could occur. Dangerous phenomena which can be in direct connection with the use of conveyor belts are the ones regarding: - sparks influence over the coating layer and/or resistance internal structure of the stopped conveyor belt; - propagation of a flame along the length of a conveyor belt that was exposed to a energy source relative high like a fire or due to blockage of a conveyor belt as a result of the driving mechanism still operating, that generate a local heating of the conveyor belt in contact with the driving drum, rollers or any other heating source generated by friction. Determining the safety parameters characteristic of the conveyor belts by employing test methods allows assessment of the safety level as well as certification of their explosion protection quality when used in environments with explosion danger.

  3. Flexible Mechanical Conveyors for Regolith Extraction and Transport

    Science.gov (United States)

    Walton, Otis R.; Vollmer, Hubert J.

    2013-01-01

    A report describes flexible mechanical conveying systems for transporting fine cohesive regolith under microgravity and vacuum conditions. They are totally enclosed, virtually dust-free, and can include enough flexibility in the conveying path to enable an expanded range of extraction and transport scenarios, including nonlinear drill-holes and excavation of enlarged subsurface openings without large entry holes. The design of the conveyors is a modification of conventional screw conveyors such that the central screw-shaft and the outer housing or conveyingtube have a degree of bending flexibility, allowing the conveyors to become nonlinear conveying systems that can convey around gentle bends. The central flexible shaft is similar to those used in common tools like a weed whacker, consisting of multiple layers of tightly wound wires around a central wire core. Utilization of compliant components (screw blade or outer wall) increases the robustness of the conveying, allowing an occasional oversized particle to pass hough the conveyor without causing a jam or stoppage

  4. Piezoelectric Driving of Vibration Conveyors: An Experimental Assessment

    Directory of Open Access Journals (Sweden)

    Emerson Bastos de Albuquerque

    2013-07-01

    Full Text Available Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer’s standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined.

  5. Programmable Current-Mode Universal Active Filters Employing Current Conveyors

    OpenAIRE

    Muhammad Taher Abuelma'atti

    1998-01-01

    Novel current-mode active filter circuits using current-conveyors are presented. The proposed circuits can realize all standard second-order filter functions. The circuits enjoy high output impedances and can, therefore, be easily cascaded to produce higher order filters. Moreover, the realized filter function can be easily programmed using at most a 13-bit digital number without changing the circuit topology.

  6. Piezoelectric driving of vibration conveyors: an experimental assessment.

    Science.gov (United States)

    Rade, Domingos Alves; de Albuquerque, Emerson Bastos; Figueira, Leandro Chaves; Carvalho, João Carlos Mendes

    2013-07-17

    Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer's standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT) patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined.

  7. Increasing of horizontal velocity of particles leaving a belt conveyor

    Directory of Open Access Journals (Sweden)

    Tavares Abraão

    2017-01-01

    Full Text Available We investigate the transport of granular materials by a conveyor belt via numerical simulations. We report an unusual increasing of particles horizontal velocity when they leave the belt and initiate free-fall. Using Discrete Elements Method, the mechanism underlying this phenomenon were investigated, and a study on how particle and system properties influences this effect were conducted.

  8. CONVEYOR DRIVE DESIGN IN COMPAS 3D SYSTEM

    Directory of Open Access Journals (Sweden)

    Mikhail Yu. Rodioshkin

    2017-03-01

    Full Text Available Introduction: Engineers often face problems associated with design and technological preparation of production and with improving the technical documentation quality. These problems can be solved using CAD/CAE/CALS-technology in industrial production. Design engineering products is related to modeling parts and assemblies in 3D CAD graphics, followed by engineering analysis. The authors demonstrate the sequence of the conveyor drive design using COMPAS application libraries. Materials and Methods: А conveyor drive mechanical transmission was calculated and simulated using COMPAS application libraries. Design calculation and construction of COMPAS 3D model are present in the article. Results:The authors proposed their method of the conveyor drive design using COMPAS 3D libraries. Discussion and Conclusions: The method of a 3D conveyor drive model design with the choice of the necessary parameters for design, calculation and simulation of mechanical transmissions as a part of the projected product was developed. The proposed technique allows using the capabilities of modern CAD software for product design related things ensuring time reduction for preparation of production, and promoting economic efficiency.

  9. 30 CFR 57.14202 - Manual cleaning of conveyor pulleys.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Manual cleaning of conveyor pulleys. 57.14202 Section 57.14202 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND... and Equipment Safety Practices and Operational Procedures § 57.14202 Manual cleaning of...

  10. Effective Conveyor Belt Inspection for Improved Mining Productivity

    Energy Technology Data Exchange (ETDEWEB)

    Chris Fromme

    2006-06-01

    This document details progress on the project entitled ''Effective Conveyor Belt Inspection for Improved Mining Productivity'' during the period from November 15, 2004 to May 14, 2004. Highlights include fabrication of an improved LED lightbar, fabrication of a line-scan sensor head for the Smart-Camera based prototype, and development of prototype vulcanized splice detection algorithms.

  11. Piezoelectric Driving of Vibration Conveyors: An Experimental Assessment

    Science.gov (United States)

    Rade, Domingos Alves; de Albuquerque, Emerson Bastos; Figueira, Leandro Chaves; Carvalho, João Carlos Mendes

    2013-01-01

    Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer's standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT) patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined. PMID:23867743

  12. Conveyorized Radio Frequency Cure of Epoxy Glass Composites.

    Science.gov (United States)

    1980-05-01

    322 ,ounds on Conveyor the rax. speed is_______:i. VJ. Vin speed cf conveyor !) elt is eaival to or lIess t .A .. es Min. speed 0.11 ft/min. wit *o...1.000 1128 5581 5.16 53 (lCT) 259,520 .090 1.004 938 4503 1 5.19 59 ( ICT ) 235,270 .086 1.006 778 3928 5.18 69 OCT) 240.010 .091 1.003 RRr 4 _ _ a 72...R. Bushelman M-29 0. Browning 7 I b’ubo".. • -a " o , -T - No. I Secio of Costn ThicknessPanel iCT a No. 1 Section of Constant Thickness Panel M

  13. Alligator gets its teeth into the conveyor market

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-08-01

    Founded in 1907 in Chicago, USA, the Flexible Steel Lacing Company grew from a manufacturer of mechanical conveyor belt fasteners to become an international leader in the manufacture of belt fasteners and related products for conveyor systems. Although operating in the local market for decades through agencies, a subsidiary company was only formed in South Africa in 1992, a decision which has served to strengthen its presence even further. Markets are in the coal, gold and metalliferous mining sectors. The Flexco and Alligator range of fasteners are marketed in the US, New Zealand, Australia, Germany, Mexico and South Africa. The most recent acquisition was Clipper, based in Grand Rapids, USA. Clipper has a range of light weight fasteners complementary to the Alligator range. 2 photos.

  14. Modeling and simulation of longwall scraper conveyor considering operational faults

    Science.gov (United States)

    Cenacewicz, Krzysztof; Katunin, Andrzej

    2016-06-01

    The paper provides a description of analytical model of a longwall scraper conveyor, including its electrical, mechanical, measurement and control actuating systems, as well as presentation of its implementation in the form of computer simulator in the Matlab®/Simulink® environment. Using this simulator eight scenarios typical of usual operational conditions of an underground scraper conveyor can be generated. Moreover, the simulator provides a possibility of modeling various operational faults and taking into consideration a measurement noise generated by transducers. The analysis of various combinations of scenarios of operation and faults with description is presented. The simulator developed may find potential application in benchmarking of diagnostic systems, testing of algorithms of operational control or can be used for supporting the modeling of real processes occurring in similar systems.

  15. New RC-Active Networks Using Current Conveyors

    Directory of Open Access Journals (Sweden)

    V. Zeman

    1997-06-01

    Full Text Available Two novel autonomous networks containing current conveyors are presented. The design of second-order oscillators and frequency filters based on the above general networks is described. The Q-factor of the circuits designed is controllable through a grounded single resistor. Some examples illustrate the procedure described. Two new one-port elements for high-order immittance realization are shown.

  16. High swing CMOS realization for third generation current conveyor (CCIII)

    OpenAIRE

    Minaei, Shahram; Yıldız, Merih; Türköz, Sait; Kuntman, Hakan

    2003-01-01

    In this paper a new CMOS realization for third generation current conveyor (CCIII) is proposed. The proposed circuit provides high swing range at terminals X and Y. The circuit has low input impedances at terminals X and Y and high output impedance at terminals Z+ and Z-. The circuit has 180MHz -3dB cutoff frequency in voltage follower mode. SPICE simulation results using MIETEC 1.2 CMOS process model are given.

  17. Investigation of used Conveyor Belts by the Differential Scanning Calorimetry Analysis

    Directory of Open Access Journals (Sweden)

    Lucia Knapcikova,

    2016-02-01

    Full Text Available In this paper is presented the use of differential scanning calorimetry analysis of the used conveyor belts. This method has been specifically tested on the individual components contained in the used conveyor belts esp. rubber pellets, cord and fabric. The result of the analysis is the determination of Tg temperature and melting temperatures (Tm by the components.Weanalyzed used conveyor belts and after this analysis it was determined components and their application to the industry

  18. Control strategy of disc braking systems for downward belt conveyors

    Institute of Scientific and Technical Information of China (English)

    Hou Youfu; Xie Fangwei; Huang Fei

    2011-01-01

    Reliability of braking systems is a key requirement to ensure the safety of in using downward belt conveyor brakes.By analyzing and comparing three commonly used braking velocity curves,we conclude that the Harrison curve is the best.Given the characteristics of a downward belt conveyor,we studied the control in a closed-loop velocity,a conventional PID method and an optimal PID control method.We used MATLAB/Simulink to simulate the three control methods.Our simulation results show that optimal PID control is especially suitable for disc braking systems.To verify the results from theoretical analysis and simulation,a multifunctional test-bed was developed to simulate the braking process of a disc brake system.Our experimental results demonstrate that the optimal PID control can make the output velocity to follow a preset velocity correctly with only small fluctuations,meeting the requirements of a flexible brake for a belt conveyor.

  19. Schmitt Trigger with Controllable Hysteresis Using Current Conveyors

    Directory of Open Access Journals (Sweden)

    Jiri Misurec

    2012-07-01

    Full Text Available Active elements working in the current or mixed mode are still attractive for the design of analog functional blocks. The current conveyor (CC was defined already in 1968. This paper deals with hysteresis comparators using second generation current conveyor. The comparator is basically a pulse circuit. In these circuits, the maximum rate of change in the output voltage is required during switching from one state to another. In comparators with operational amplifiers the switching time is given by the slew rate of the operational amplifier used, which is not too high. If a current conveyor is used, the time of switching the comparator gets shorter. The comparator is capable to operate at a higher frequency bands and if it is used, for example, in converters, a higher operating frequency can be reached. The connection of an inverting and a non-inverting comparator with adjustable hysteresis is shown as a practical implementation. Using the AD844, results of experimental measurements are presented that confirm the theoretical  assumptions and the results of computer simulation.

  20. Dunlop Enerka Belting supplies and installs Europe's longest conveyor belt at British Coal-Mine

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@ Dunlop Enerka Belting of Farington, U.K., has supplied a steel cord conveyor belt to the mine complex at Selby in North Yorkshire operated by RJB Mining plc. The new conveyor belt replaces the belt supplied and installed in 1981 by Dunlop Enerka Belting (then BTR Belting Ltd.).

  1. PROPOSALS ON IMPROVING THE EXCAVATION, TRANSPORT AND COAL DEPOSIT, USING THE RUBBER CONVEYOR BELT

    Directory of Open Access Journals (Sweden)

    Nicoleta-Maria MIHUT

    2016-05-01

    Full Text Available In this work we make a study of the improvement methods of quantity of material transported by conveyor belt. Determination of discharge of solids entail establish of the parameters of the conveyor belt. As a result, we determine the belt speed who provide maximum discharge of solids materials.

  2. Implementation of Multi-Body Dynamics Simulation for the Conveyor Chain Drive System

    Directory of Open Access Journals (Sweden)

    Suvanjumrat Chakrit

    2017-01-01

    Full Text Available The conveyor chain drive system which included four sprockets, four flat bars (chain guides and one conveyor chain had been assembled into commercial software, MSC.ADAMS. The conveyor chain was connected with rollers for running on the chain guides. The multi-body dynamics (MBD simulation was implemented to study the large displacement of chain components which happened during rotations of the symmetric model of the conveyor chain drive system. The physical experiment had obtained by construction of the conveyor chain drive system regarding the MBD model. The speeds of chain drive were adjusted by a gear motor with a converter. The trajectory of conveyor chain links which respectively meshed and ran on sprockets and chain guides was recorded by a high speed camera. Furthermore, impact-contact forces by a collision of components in the conveyor chain drive system during rotation were analysis. The comparison between MBD simulation and physical experiment of the conveyor chain drive system was performed for validation of simulation models. The MBD simulation results were in good agreement with the experimental data which obtained an average error of 3.95%.

  3. Availability analysis of the main conveyor in the Svea Coal Mine in Norway

    Institute of Scientific and Technical Information of China (English)

    Simon Furuly; Javad Barabady; Abbas Barabadi⇑

    2014-01-01

    Reliability and maintainability of mining industry is more in focus than ever, and the mining systems are becoming more complex and the equipment more expensive to repair or modify. Unplanned failures can result in significant costs, especially when the machinery is hard to repair or spare parts are far away. This paper presents a case study describing a reliability and maintainability analysis of the main conveyor system of the Svea Coal Mine located in Svalbard, Norway. The conveyor system includes several separate conveyors. In this study, the main six conveyors of the whole system were selected for the analysis. The failure and repair data of the conveyors were collected for the whole year of 2010 using maintenance and daily reports. The date was analyzed and the result shows that the availability of six conveyers is 96.44%for one year of operation. However, reliability of these conveyers needs to be improved in order to reduce the number of failures.

  4. Long-Term Predictions of Global Climate Using the Ocean Conveyor

    Energy Technology Data Exchange (ETDEWEB)

    Ray, P.; Wilson, J.R.

    2003-01-01

    Many have attributed the Great Ocean Conveyor as a major driver of global climate change over millennia as well as a possible explanation for shorter (multidecadal) oscillations. The conveyor is thought to have a cycle time on the order of 1000 years, however recent research has suggested that it is much faster than previously believed (about 100 years). A faster conveyor leads to the possibility of the conveyor's role in even shorter oscillations such as the El Nino/Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO). The conveyor is primarily density driven. In this study the salty outflow of the Red Sea is used to predict its behavior ten years into the future. A successful model could lead to a long-term prediction (ten years) of El Ninos, Atlantic hurricane season intensity, as well as global temperature and precipitation patterns.

  5. An integrated multi-criteria decision-making methodology for conveyor system selection

    Directory of Open Access Journals (Sweden)

    Pairat Jiamruangjarus

    2016-12-01

    Full Text Available Material handling equipment (MHE is important for every industry because it has an effect on the productivity of manufacturing. Conveyor systems are presently one popular type of MHE. This paper presents an integration of the analytic network process (ANP with the benefits, opportunities, costs and risk (BOCR model in order to select the best conveyor system. The proposed model established a network with four merits, six strategies criteria, and twenty six sub-criteria with four alternatives (present, roller conveyor, chain conveyor, and monorail. The ANP is to determine the relative weights of an evaluative criteria and decision alternatives. Therefore, the final ranking of the alternatives are calculated by synthesizing the score of each alternative under BOCR. The results showed that the best alternative under all five methods is the chain conveyor. These research results can be easily applied, adapted and used to improve performance of selecting the conveyer system in small and medium enterprises through large industries.

  6. 3D-Virtualization of a Conveyor Machine

    OpenAIRE

    Taipalus, Joonas

    2016-01-01

    The purpose of this thesis was to create a virtually working 3D-model of a conveyor machine. The topic and the machine were provided by Siemens. Siemens will use this virtual model to ease their education, as it is not necessary to have the real equipment nearby. The first model was made in Solid Edge, and then transported to Siemens NX and MCD –software. The PLC-program was made in Siemens TIA portal. The connection between TIA portal and MCD was made with an OPC-server. The theory part of t...

  7. Effective Conveyor Belt Inspection for Improved Mining Productivity

    Energy Technology Data Exchange (ETDEWEB)

    David LaRose

    2006-07-01

    This document details progress on the project ''Effective Conveyor Belt Inspection for Improved Mining Productivity'' during the period from November 15, 2005 to May 14, 2006. Highlights include significant improvements in the accuracy and reliability of computer-vision based vulcanized splice detection, deployment of the vulcanized splice detection algorithms for daily use in two working mines, and successful demonstration of an early prototype of a Smart-Camera based system for on-site mechanical splice detection in coal mine installations.

  8. Single beam optical conveyor belt for chiral particles

    CERN Document Server

    Fernandes, David E

    2016-01-01

    We propose a novel paradigm to selectively manipulate and transport small engineered chiral particles and discriminate different enantiomers using unstructured chiral light. It is theoretically shown that the response of a chiral metamaterial particle may be tailored to enable an optical conveyor belt operation with no optical traps, such that for a fixed incident light helicity and independent of the nanoparticle location, it is either steadily pushed towards the direction of the photon flow or steadily pulled against the photon flow. Our findings create new opportunities for unconventional optical manipulations of tailored nanoparticles and may have applications in sorting racemic mixtures of artificial chiral molecules and in particle delivery.

  9. Global ocean conveyor lowers extinction risk in the deep sea

    Science.gov (United States)

    Henry, Lea-Anne; Frank, Norbert; Hebbeln, Dierk; Weinberg, Claudia; Robinson, Laura; van de Flierdt, Tina; Dahl, Mikael; Douarin, Melanie; Morrison, Cheryl; Correa, Matthias Lopez; Rogers, Alex D.; Ruckelshausen, Mario; Roberts, J. Murray

    2014-01-01

    General paradigms of species extinction risk are urgently needed as global habitat loss and rapid climate change threaten Earth with what could be its sixth mass extinction. Using the stony coral Lophelia pertusa as a model organism with the potential for wide larval dispersal, we investigated how the global ocean conveyor drove an unprecedented post-glacial range expansion in Earth׳s largest biome, the deep sea. We compiled a unique ocean-scale dataset of published radiocarbon and uranium-series dates of fossil corals, the sedimentary protactinium–thorium record of Atlantic meridional overturning circulation (AMOC) strength, authigenic neodymium and lead isotopic ratios of circulation pathways, and coral biogeography, and integrated new Bayesian estimates of historic gene flow. Our compilation shows how the export of Southern Ocean and Mediterranean waters after the Younger Dryas 11.6 kyr ago simultaneously triggered two dispersal events in the western and eastern Atlantic respectively. Each pathway injected larvae from refugia into ocean currents powered by a re-invigorated AMOC that led to the fastest postglacial range expansion ever recorded, covering 7500 km in under 400 years. In addition to its role in modulating global climate, our study illuminates how the ocean conveyor creates broad geographic ranges that lower extinction risk in the deep sea.

  10. Nano-optical conveyor belt with waveguide-coupled excitation.

    Science.gov (United States)

    Wang, Guanghui; Ying, Zhoufeng; Ho, Ho-pui; Huang, Ying; Zou, Ningmu; Zhang, Xuping

    2016-02-01

    We propose a plasmonic nano-optical conveyor belt for peristaltic transport of nano-particles. Instead of illumination from the top, waveguide-coupled excitation is used for trapping particles with a higher degree of precision and flexibility. Graded nano-rods with individual dimensions coded to have resonance at specific wavelengths are incorporated along the waveguide in order to produce spatially addressable hot spots. Consequently, by switching the excitation wavelength sequentially, particles can be transported to adjacent optical traps along the waveguide. The feasibility of this design is analyzed using three-dimensional finite-difference time-domain and Maxwell stress tensor methods. Simulation results show that this system is capable of exciting addressable traps and moving particles in a peristaltic fashion with tens of nanometers resolution. It is the first, to the best of our knowledge, report about a nano-optical conveyor belt with waveguide-coupled excitation, which is very important for scalability and on-chip integration. The proposed approach offers a new design direction for integrated waveguide-based optical manipulation devices and its application in large scale lab-on-a-chip integration.

  11. Global ocean conveyor lowers extinction risk in the deep sea

    Science.gov (United States)

    Henry, Lea-Anne; Frank, Norbert; Hebbeln, Dierk; Wienberg, Claudia; Robinson, Laura; van de Flierdt, Tina; Dahl, Mikael; Douarin, Mélanie; Morrison, Cheryl L.; López Correa, Matthias; Rogers, Alex D.; Ruckelshausen, Mario; Roberts, J. Murray

    2014-06-01

    General paradigms of species extinction risk are urgently needed as global habitat loss and rapid climate change threaten Earth with what could be its sixth mass extinction. Using the stony coral Lophelia pertusa as a model organism with the potential for wide larval dispersal, we investigated how the global ocean conveyor drove an unprecedented post-glacial range expansion in Earth's largest biome, the deep sea. We compiled a unique ocean-scale dataset of published radiocarbon and uranium-series dates of fossil corals, the sedimentary protactinium-thorium record of Atlantic meridional overturning circulation (AMOC) strength, authigenic neodymium and lead isotopic ratios of circulation pathways, and coral biogeography, and integrated new Bayesian estimates of historic gene flow. Our compilation shows how the export of Southern Ocean and Mediterranean waters after the Younger Dryas 11.6 kyr ago simultaneously triggered two dispersal events in the western and eastern Atlantic respectively. Each pathway injected larvae from refugia into ocean currents powered by a re-invigorated AMOC that led to the fastest postglacial range expansion ever recorded, covering 7500 km in under 400 years. In addition to its role in modulating global climate, our study illuminates how the ocean conveyor creates broad geographic ranges that lower extinction risk in the deep sea.

  12. Dynamic analysis of scraper conveyor operation with external loads

    Directory of Open Access Journals (Sweden)

    Świder Jerzy

    2017-01-01

    Full Text Available A load to an armoured face conveyor (AFC during coal mining is changeable and very difficult or even impossible to be predicted. Changes of the load to the upper scraper chain affect the load of the driving motor and generate changes in a scraper chain tension. Impact of increasing the external load to the upper scraper chain on the operation of electric motors and on the scraper chain tension is presented. The developed numerical model of the Rybnik 850 conveyor enabled identifying the places of the scraper chain high tension or places of its loosening. An impact of changing frequency of driving motor voltage on AFC’s operational conditions was tested and analysed using the AFC’s numerical model. During tests, tension of the scraper chain on the discharge end and the return end was recorded. High tension of the scraper chain and its loosening during the changeable load were also recorded on upward and downward transportation of run-of-mine material.

  13. The fluid–solid coupling analysis of screw conveyor in drilling fluid centrifuge based on ANSYS

    Directory of Open Access Journals (Sweden)

    Hongbin Liu

    2015-09-01

    Full Text Available In the centrifugal separations of drilling fluid, screw conveyor is a critical component to push and separate the sediment. The work performance and structural parameters of conveyor are immediately related to the production capability, the working life and the separating effect of the centrifuge. The existing researches always use the theoretical calculation of the approximate loads to analyze the strength of conveyor, and it cannot reflect the stress situations accurately. In order to ensure the precise mastery of the working performance, this article obtained pressure distribution under working conditions from CFX evaluation and gained equivalent stress and deformation under several load conditions by using the ANSYS Workbench platform to check the strength of conveyor. The results showed that the influence of centrifugal hydraulic pressure was less than that of centrifugal force on the strength and deformation of conveyor. Besides, the maximum equivalent stress occurred at the inside of the feed opening, while the maximum deformation occurred at the conveyor blade edge of taper extremity. Furthermore, whether considered the feed opening or not, the computing model had a great influence on the analysis results, and the simplified loads had a great influence on the deformation analysis results. The methods and results from this article can provide reference for the design and the improvement of screw conveyor.

  14. A Parametric Energy Model for Energy Management of Long Belt Conveyors

    Directory of Open Access Journals (Sweden)

    Tebello Mathaba

    2015-12-01

    Full Text Available As electricity prices continue to rise, the increasing need for energy management requires better understanding of models for energy-consuming applications, such as conveyor belts. Conveyor belts are used in a wide range of industries, including power generation, mining and mineral processing. Conveyor technological advances are leading to increasingly long conveyor belts being commissioned. Thus, the energy consumption of each individual belt conveyor unit is becoming increasingly significant. This paper proposes a generic energy model for belt conveyors with long troughed belts. The model has a two-parameter power equation, and it uses a partial differential equation to capture the variable amount of material mass per unit length throughout the belt length. Verification results show that the power consumption calculations of the newly proposed simpler model are consistent with those of a known non-linear model with an error of less than 4%. The online parameter identification set-up of the model is proposed. Simulations indicate that the parameters can be identified successfully from data with up to 15% measurement noise. Results show that the proposed model gives better predictions of the power consumed and material delivered by a long conveyor belt than the steady-state models in the current literature.

  15. VIRTUAL MODEL OF A ROLLER CONVEYOR INTEGRATED INTO A LOGISTIC FLOW

    Directory of Open Access Journals (Sweden)

    POPESCU Adrian

    2015-11-01

    Full Text Available In this article is presented, with the help of graphics, a logistic flow for palletizing and wrapping operations. The loaded pallets are transported by means of a roller conveyor. Creating the virtual model for the conveyer allows us to emphasize the compatibility elements between on the one hand the mechanical assemblies of the flow components and on the other hand the subassemblies of the conveyer structure. The paper has focused on the presentation of the conveyor specific assembly and how are placed the sensors on the mechanical structure of the conveyor. Finally, the main working phases are graphically presented within the flow, highlighting the loaded pallet positions in the flow.

  16. Theoretical research on hydroviscous speed-adjusting clutch in soft-start of belt conveyor

    Institute of Scientific and Technical Information of China (English)

    ZHOU Man-shan; ZHANG Yuan

    2005-01-01

    Through research on the application of hydroviscous speed-adjusting clutch in belt conveyor, this paper concluded that hydroviscous speed-adjusting clutch has many advantages such as controllable start and stop, overload protection and multi-motor power equilibrium. But its theory when used in large power fan and pump could not meet the needs of belt conveyor soft-start operation. Focusing on the theoretical analysis of the lubrication oil flow needed by the transmission procedure to form the oil-film. Put forward concrete calculation methods of lubrication flow and how to decide number of oil-films used in belt conveyor.

  17. Advanced computer modeling techniques expand belt conveyor technology

    Energy Technology Data Exchange (ETDEWEB)

    Alspaugh, M.

    1998-07-01

    Increased mining production is continuing to challenge engineers and manufacturers to keep up. The pressure to produce larger and more versatile equipment is increasing. This paper will show some recent major projects in the belt conveyor industry that have pushed the limits of design and engineering technology. Also, it will discuss the systems engineering discipline and advanced computer modeling tools that have helped make these achievements possible. Several examples of technologically advanced designs will be reviewed. However, new technology can sometimes produce increased problems with equipment availability and reliability if not carefully developed. Computer modeling techniques that help one design larger equipment can also compound operational headaches if engineering processes and algorithms are not carefully analyzed every step of the way.

  18. Theoretical analysis of optical conveyor belt with plasmonic nanodisk array

    Science.gov (United States)

    Lee, Changhun; Kim, Donghyun

    2017-07-01

    Plasmonic optical trapping allows trapping and manipulation of micro- and even nanometer-sized particles using localized and enhanced electric fields by plasmon resonance in metallic nanostructure. We consider an optical conveyor belt consisting of an array of nanodisks acting as optical tweezers with different sizes to implement a system to trap and manipulate particles through a laser-induced gradient force. An electric field induced and localized at each optical resonator is sensitive to the wavelength and polarization. The maximum electric field is enhanced at resonant wavelength depending on the shape and size of the plasmonic nanostructure used for light localization. By changing the light wavelength and polarization, the position of localized light induced in the disk can be determined and nanoparticles can be moved to a desired location through the variation of resonance conditions without any mechanical forces.

  19. Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter

    Science.gov (United States)

    Polak, Josef; Jerabek, Jan; Langhammer, Lukas; Sotner, Roman; Dvorak, Jan; Panek, David

    2016-07-01

    This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Adjustable Current Amplifier (DACA) and two Dual-Output Controllable Current Conveyors (CCCII +/-). This filter is designed for use in current mode. The filter was designed of the single input multiple outputs (SIMO) type, therefore it has only one input and three outputs with individual filtering functions. DACA element used in a newly proposed circuit is present in form of an integrated chip and the current conveyors are implemented using the Universal Current Conveyor (UCC) chip with designation UCC-N1B. Proposed frequency filter enables independent control of the pole frequency using parameters of two current conveyors and also independent control of the quality factor by change of a current gain of DACA.

  20. Novel Wien Bridge Oscillator Design Using Functional Block Structure with Current Conveyors

    Directory of Open Access Journals (Sweden)

    Pavel Brandstetter

    2012-01-01

    Full Text Available The purpose of this paper is to generally present possibilities of the current conveyor use in the well-known active electronic circuits. Current conveyors are able to substitute all known active elements. This claim is supported by the fact, that four basic functional block structures can be realized by use of current conveyors - voltage-controlled voltage source, voltage-controlled current source, current-controlled current source and current-controlled voltage source. The paper presents particular example of use of functional block structure with current conveyors in Wien bridge oscillator, where it successfully substitutes operational amplifier on the place of active element. Both theoretical formulae and design description are given. Finally, OrCAD PSpice simulation results are presented.

  1. Design Analysis of Conveyor Mechanism Unit for Automatic Car Park System

    Directory of Open Access Journals (Sweden)

    Preeti S. Dambhare,

    2015-09-01

    Full Text Available The design analysis of a conveyor mechanism for an automatic car park is discussed. The conveyor assembly is made up of three units; the rack-pinion unit, the cable drive unit and the cantilever. The rack-pinion unit converts the rotational motion of a stepper motor to a linear forward and backward motion of the conveyor. The cable drive converts the rotational motion of another stepper motor to upward and downward motion of the cantilever to lift and lower the car at will. The cantilever is responsible for positioning the vehicle in the stack unit. The parameter for the cantilever is estimated to avoid excess deflection that could result from impact loading of a vehicle on the lift mechanism. The pinion-rack design for strength and rigidity is considered for the load required to be translated by the conveyor. The prototype was interfaced with a computer for operation using parallel port.

  2. Study on conveyor natural frequency and time interval for switching off resistances

    Institute of Scientific and Technical Information of China (English)

    李光布; 杨汝清

    2004-01-01

    A conveyor belt driven by wound rotor motors produces dynamic tension, velocity and acceleration during starting. The terrible situation (such as resonance) in dynamic analysis and design is that system natural frequencies are equal to those for switching off electric resistances. This paper analyzes and determines system natural frequencies based on a modeling method of receptances with the analysis of sub-systems model and of the principle of their addition and conveyor loop closure. It also puts forward to calculate the time interval for switching off electric resistances. The starting of one conveyor is simulated by lumped-mass-spring-model software to further illustrate the influence of time interval for switching off electric resistances on conveyor dynamic behavior. Two methods are also compared. The receptance model is proved to be an excellent alternative.

  3. Effects of industrial microcomputer use in control systems for machines and conveyors in surface mining

    Energy Technology Data Exchange (ETDEWEB)

    Borczyk, Z.; Rosseger, A. (Poltegor-Instytut, Wroclaw (Poland))

    1991-01-01

    Evaluates use of the ComPan Pzaz microcomputers manufactured in Poland for control of bucket wheel excavators without thrust action and for belt conveyors used in brown coal surface mines in Poland. The microcomputer consists of 14 standard microprocessor controller modules and 4 specialized modules. Structure of the control system, types of operations controlled by the system and effects of computerized control on safety and efficiency of operation of bucket wheel excavators are analyzed. Use of the ComPan Pzaz microcomputers for control of steep-angle conveyor systems (with a drive power from 1,000 kW to 4,000 kW) is evaluated. The system controls conveyor start-up and conveyor braking. Selected aspects of ComPan Pzaz reliability and service are also discussed. 2 refs.

  4. the screw-conveyor vane design for piece-wise construction

    African Journals Online (AJOL)

    Dr Obe

    By. G O EZEKWE. Mechanical Engineering Department, ... granular, Powdery or slurry material is by the screw conveyor. ... manufacture, the spiral blade can withstand axial load. ... wax process, do not provide the solution The first reason is ...

  5. Determination of The Mechanical Power in Belt Conveyor's Drive System in Industrial Conditions

    Science.gov (United States)

    Król, Robert; Kaszuba, Damian; Kisielewski, Waldemar

    2016-10-01

    Mechanical power is a value which carries a significant amount of information on the properties of the operating status of the machine analysed. The value of mechanical power reflects the degree of load of the drive system and of the entire machine. It is essential to determine the actual efficiency of the drive system η [%], which is the key parameter of the energy efficiency of the drive system. In the case of a single drive of a belt conveyor the actual efficiency is expressed as the ratio of mechanical output power Pm [W] at the drive pulley shaft to active electrical power drawn by the motor Pe [W]. Furthermore, the knowledge about the mechanical power from all drives of the multiple driven belt conveyor allows for the analysis of load distribution between the drives. In case of belt conveyor, the mechanical power Pm [W] generated by the drive at the drive pulley's shaft is equal to its angular velocity ω [rad / s] multiplied by the torque T [Nm]. The measurement of angular velocity is relatively easy and can be realized with the use of a tachometer or can be determined on the basis of linear velocity of the conveyor belt during belt conveyor's steady state operation. Significantly more difficult to perform in industrial conditions is the measurement of the torque. This is due to the operational conditions of belt conveyors (e.g. dustiness, high humidity, high temperature) and tight assembly of the drive components without the possibility of their disassembly. It makes it difficult or even impossible to measure the torque using a number of the techniques available, causing an individual approach to each object of research. The paper proposes a measurement methodology allowing to determine the mechanical power in belt conveyors drives which are commonly used in underground and surface mining. The paper presents result of the research into mechanical power in belt conveyor's drive carried out in underground mine conditions.

  6. Theoretical basis and industrial applications of energy – saving and increased durability belt conveyors

    Directory of Open Access Journals (Sweden)

    Antoniak Jerzy

    2003-09-01

    Full Text Available Theoretical basis used to build new generation of belt conveyors is presented is this paper. These conveyors are characterized by better energy-saving parameters of the transport of run-of-mine and higher reliability. Examples of current technical solutions applied in coal mines have been used to present the results of this research. The paper is summarized with conclusions and remarks.

  7. Diagnostics and computer test of a longwall scraper conveyor; Diagnostyka i atest komputerowy scianowego przenosnika zgrzeblowego

    Energy Technology Data Exchange (ETDEWEB)

    Dolipski, M.; Remiorz, E. [Politechnika Slaska, Gliwice (Poland)

    1996-08-01

    The article draws the attention to the need of continuous estimation of the technological state of a longwall scraper conveyor by means of vibration signals analysis. The chain vibration diagnostics as well as mechanical asymmetry one of the main and auxiliary drives is here very useful. There are also given the importance and composition of a computer test at the decisive stage of longwall conveyor purchase. (author). 2 refs.; 4 figs.

  8. Experimental Study of Kinetic Properties of Pyrolysis for Conveyor Belt in Coal Mine

    Institute of Scientific and Technical Information of China (English)

    SONG Zheng-chang

    2005-01-01

    The combustion of conveyor belt is a leading factor of mine fire. In this paper, the pyrolysis properties of ordinary conveyor belt and fire-resistant belt were studied experimentally with thermo-gravimetric analysis and derivative thermo-gravimetric analysis, and the curves of pyrolysis properties were achieved. On this basis, the activation energy and reaction order of pyrolysis were obtained in combination with theoretical analysis, aiming to provide data for further numerical simulation and simulating experiment of mine fire.

  9. THE INFLUENCE OF INCREASING RELIABILITY OF BELT CONVEYORS UPON THE PRODUCTIVITY OF LIGNITE QUARRIES

    Directory of Open Access Journals (Sweden)

    FLORIN-MIHAI NIȚESCU

    2012-10-01

    Full Text Available At present belt conveyors have an important role in the mines of lignite quarries because they contribute decisively to achieving an optimum production. From this point of view the management of mines should be constantly preoccupied with ensuring, in optimal conditions, the operation of these elements of fixed capital and, if it is necessary they should maintain constant reliability. In this context, this paper has as theme the relation between the reliability of conveyors and the productivity within lignite quarries.

  10. Optimizing the Pipe Diameter of the Pipe Belt Conveyor Based on Discrete Element Method

    Science.gov (United States)

    Guo, Yong-cun; Wang, Shuang; Hu, Kun; Li, De-yong

    2016-03-01

    In order to increase the transport volume of the pipe belt conveyor and reduce lateral pressure of the supporting roller set, this study aims to optimize the pipe diameter of the pipe belt conveyor. A mechanical model of the pipe belt conveyor with six supporting roller sets in the belt bearing section was built based on the infinitesimal method, and the formula for calculating the lateral pressure of each supporting roller was deduced on the basis of reasonable assumption. Simulated analysis was carried out on the operation process of the pipe belt conveyor by using the discrete element method. The result showed that, when the other conditions were certain, as the pipe diameter increased, the average lateral pressure of the supporting roller set increased, with a gradually decreasing increment, which was consistent with the calculated result of the theoretical formula. An optimized pipe diameter under the current conditions was obtained by fitting the curve of the formula for calculating the transport volume of the pipe belt conveyor and its simulation curve. It provided a certain reference value for improving the transport efficiency and prolonging the service life of the pipe belt conveyor.

  11. QUALITATIVE ANALYSIS OF DEPENDENCE OF DRIVE POWER HORIZONTAL-INCLINED BELT CONVEYOR ON ITS INITIAL PARAMETERS

    Directory of Open Access Journals (Sweden)

    V. M. Bohomaz

    2017-02-01

    Full Text Available Purpose.One of the main elements of band conveyors is a drive. To analyze the effect of design parameters on the drive power it is necessary to carry out the calculations according to standard procedures outlined in the current technical literature. The main design parameters of the band conveyor are: the type of cargo, project performance, the geometric dimensions of sections and track configuration as a whole. The feature of band conveyor calculation as compared to the elevators is the dependence of the band width on its performance, the inclination angle and the type of cargo. In the article for the account of this fact during calculations it is necessary to construct the dependence of the band width on the generalized parameter, which takes into account change in the design parameters. To determine the general pattern of changing the value of band conveyor drive power when varying its design parameters in the article it is necessary to construct the corresponding graphic dependences taking into account the standard sizes and bands parameters. Methodology. We consider the band conveyor with two sections: the inclined and horizontal one. It is conducted a detailed analysis of dependence of the conveyor band width and its drive power on the type of cargo, project performance, geometric dimensions and configuration of the conveyor track, using the appropriate parameter dependences constructed by the authors in previous papers. Findings. For band conveyors of this type there were constructed the graphics dependences of the band width on the parameter characterizing the project performance and the inclination angle of the track section, and on the performance at a fixed angle of inclination. Taking into account the changes in the band width with an increase in the value of project performance the graph dependences of drive power on the productivity and the inclination angle of the inclined section were built. Originality. For the first time there

  12. Programmable Input Mode Instrumentation Amplifier Using Multiple Output Current Conveyors

    Directory of Open Access Journals (Sweden)

    Pankiewicz Bogdan

    2017-03-01

    Full Text Available In this paper a programmable input mode instrumentation amplifier (IA utilising second generation, multiple output current conveyors and transmission gates is presented. Its main advantage is the ability to choose a voltage or current mode of inputs by setting the voltage of two configuration nodes. The presented IA is prepared as an integrated circuit block to be used alone or as a sub-block in a microcontroller or in a field programmable gate array (FPGA, which shall condition analogue signals to be next converted by an analogue-to-digital converter (ADC. IA is designed in AMS 0.35 µm CMOS technology and the power supply is 3.3 V; the power consumption is approximately 9.1 mW. A linear input range in the voltage mode reaches ± 1.68 V or ± 250 µA in current mode. A passband of the IA is above 11 MHz. The amplifier works in class A, so its current supply is almost constant and does not cause noise disturbing nearby working precision analogue circuits.

  13. Research on Magnetic Model of Low Resistance Permanent Magnet Pipe Belt Conveyor

    Science.gov (United States)

    Wang, Shuang; Li, De-yong; Guo, Yong-cun

    2016-09-01

    In view of the feasibility of a new type of low resistance permanent magnet pipe belt conveyor, the magnetic properties of the permanent magnet magnetic pipe conveyor belt system are studied. Based on the molecular current hypothesis, the mathematical model of the three dimensional radial magnetic force of permanent magnet pipe conveyor belt was established. The mathematical model of the radial magnetic force was derived, and the influence factors of the radial magnetic force were derived. The finite element simulation of permanent magnet-magnetic pipe conveyor belt magnetic model was carried out, then the magnetic flux density distribution chart under the conditions of different remanence intensity of different permanent magnet and different lengths of the permanent magnets (along the transport direction) were obtained. The simulation results are consistent with the calculation results, which shows that the permanent magnet pipe belt conveyor is feasible. Under certain conditions, the radial magnetic force has nonlinear increase relations with residual magnetism of permanent magnet and the length of the permanent magnet (along the transport direction).

  14. Conveyor belts as factor in fire hazard in European coal mines

    Energy Technology Data Exchange (ETDEWEB)

    Zyska, B.

    1981-03-01

    Major mine accidents in the United Kingdom (Creswell, 1950), Czechoslovakia (Dukla, 1961) and in the Federal Republic of Germany (Schlagel und Eisen, 1977) caused by fires of conveyor belts are described. Methods of testing fire resistant conveyor belts, used in the following countries, are evaluated: Belgium, Czechoslovakia, France, German Democratic Republic, Federal Republic of Germany, Romania, Hungary, United Kingdom and USSR. The following methods are characterized: flame method, oxygen coefficient method, friction method, propane method, model tunnel method, 1 to 1 scale tunnel method, calorimetric method and a so-called flame tube method. Comparative evaluation of the methods and their efficiency is presented. Development of non-inflammable conveyor belts in: Czechoslovakia, Federal Republic of Germany and in the United Kingdom is discussed (elimination of rubber belts and introduction of PVC belts). It is stressed that three methods of testing fire resistance of conveyor belts are of particular importance: friction method, model tunnel method and 1 to 1 scale tunnel method. Standards used in Poland to test properties of conveyor belts are also described. 44 refs.

  15. The Question of Energy-Efficient Design of the Automated Electric Drive of Multi-Engine Belt Conveyors

    Directory of Open Access Journals (Sweden)

    Semykina Irina

    2015-01-01

    Full Text Available The article proposes a method for improving the energy efficiency of multi-motor variable frequency electric drives of trunk belt conveyors, based on the conveyor speed changing and controlling of the magnetic state of the motor. At conclusion, economic and energy effects of the implementation are estimated.

  16. Design Considerations for CMOS Current Mode Operational Amplifiers and Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    This dissertation is about CMOS current conveyors and current mode operational amplifiers (opamps). They are generic devices for continuous time signal processing in circuits and systems where signals are represented by currents.Substantial advancements are reported in the dissertation, both...... implementations of current mode opamps in CMOS technology are described. Also, current conveyor configurations with multiple outputs and flexible feedback connections from outputs to inputs are introduced. The dissertation includes several examples of circuit configurations ranging from simple class A and class...... AB conveyor implementations to implementations based on purely digital circuit structures and on more complex analog subsystems such as a voltage mode opamp with feedback to provide a voltage follower action. An important by-product of the investigation of current mode structures is the definition...

  17. Third Order Low-Pass Filter Using Synthetic Immittance Elements with Current Conveyors

    Directory of Open Access Journals (Sweden)

    Pavel Brandstetter

    2012-01-01

    Full Text Available The paper deals with a theoretical proposal of the resulting circuit of the frequency filter using synthetic immittance elements of higher order with current conveyors. The text pays particular attention to design process of synthetic immittance elements, explains the principle of increasing of order, which is then reflected to the frequency filter order. The text then deals less with the theory of current conveyors, which has already been discussed, in detail, in previous papers. Universal current conveyor (UCC is discussed more. This active element is used for the theoretical implementation of the synthetic element solution used in the frequency filter. The theoretical knowledge is then demonstrated in the design of 3rd order low-pass frequency filter. The final functionality of the proposed frequency filter circuit solution is validated by PSpice simulation.

  18. Optimal Driving of Large Belt Conveyor with Multi-roller Variable-Frequency Drive

    Institute of Scientific and Technical Information of China (English)

    FU Jun-qing; WANG Cong; LI Yu-jin

    2004-01-01

    in this paper, an electromechanically coupled mathematic model of multi-roller driving system for belt conveyor is set up, and the computing equations for dynamic displacement and dynamic tension of the conveyor are also formulated when the hoister is used for straining. Based on the belt conveyor of main inclined shaft in Chengzhuang coal mine, the driving torque, driving power and starting-speed characteristic of each electric motor are studied and measured when multi-roller variable-frequency drive (power distribution 2∶1) is used. The optimal control and the optimal starting-acceleration of the multi-roller variable-frequency drive are determined by a large number of industrial experiments and theoretical calculations.

  19. Design of belt conveyor electric control device based on CC-link bus

    Science.gov (United States)

    Chen, Goufen; Zhan, Minhua; Li, Jiehua

    2016-01-01

    In view of problem of the existing coal mine belt conveyor is no field bus communication function, two levels belt conveyor electric control system design is proposed based on field bus. Two-stage belt conveyor electric control system consists of operation platform, PLC control unit, various sensors, alarm device and the water spraying device. The error protection is realized by PLC programming, made use of CC-Link bus technology, the data share and the cooperative control came true between host station and slave station. The real-time monitor was achieved by the touch screen program. Practical application shows that the system can ensure the coalmine production, and improve the automatic level of the coalmine transport equipment.

  20. Current and Voltage Conveyors in Current- and Voltage-Mode Precision Full-Wave Rectifiers

    Directory of Open Access Journals (Sweden)

    J. Koton

    2011-04-01

    Full Text Available In this paper new versatile precision full-wave rectifiers using current and/or voltage conveyors as active elements and two diodes are presented. The performance of these circuit solutions is analysed and compared to the opamp based precision rectifier. To analyze the behavior of the functional blocks, the frequency dependent RMS error and DC transient value are evaluated for different values of input voltage amplitudes. Furthermore, experimental results are given that show the feasibilities of the conveyor based rectifiers superior to the corresponding operational amplifier based topology.

  1. Feeding Control System of Conveyor-belt Based on Image Processing

    Institute of Scientific and Technical Information of China (English)

    MENG Fan-qin; WANG Yao-cai; XI Li-bo; WANG Jun-wei

    2004-01-01

    Based on the real time measurement of the width of coal flow, the method for measuring the width and the relative position of coal flow on a conveyor-belt by image processing was presented. A feeding control system of conveyor-belt was proposed using a fuzzy controller. This control system consists of CCD camera, universal image sampling system, control network and executor. The result shows that the algorithm used in the image processing is simple and efficient, and the measuring error of width is less than 4%.

  2. Simply Adjustable Sinusoidal Oscillator Based on Negative Three-Port Current Conveyors

    Directory of Open Access Journals (Sweden)

    R. Sotner

    2010-09-01

    Full Text Available The paper deals with sinusoidal oscillator employing two controlled second-generation negative-current conveyors and two capacitors. The proposed oscillator has a simple circuit configuration. Electronic (voltage adjusting of the oscillation frequency and condition of oscillation are possible. The presented circuit is verified in PSpice utilizing macro models of commercially available negative current conveyors. The circuit is also verified by experimental measurements. Important characteristics and drawbacks of the proposed circuit and influences of real active elements in the designed circuit are discussed in detail.

  3. Voltage-Controlled Square/Triangular Wave Generator with Current Conveyors and Switching Diodes

    Directory of Open Access Journals (Sweden)

    Martin Janecek

    2012-12-01

    Full Text Available A novel relaxation oscillator based on integrating the diode-switched currents and Schmitt trigger is presented. It is derived from a known circuit with operational amplifiers where these active elements were replaced by current conveyors. The circuit employs only grounded resistances and capacitance and is suitable for high frequency square and triangular signal generation. Its frequency can be linearly and accurately controlled by voltage that is applied to a high-impedance input. Computer simulation with a model of a manufactured conveyor prototype verifies theoretic assumptions.

  4. In Retrospect, Five Year's Splendid Journey of Wind and Rain,Look into the Future, Five Year's Grand Prospect--Shanxi Phoenix Conveyor Belt Co., Ltd.

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

      On January 21, 2006, ShanxiPhoenix Conveyor Belt Co.,Ltd. held the 2005 Honor Convention. Those who attended the conference were Mr. Ren Runhou, Board Chairman of Shanxi Phoenix Conveyor Belt Co., Ltd., Board Chairman & General Manager of Shanxi Luan Mining Group, Mr. Shi Wenlin, Director of Shanxi Phoenix Conveyor Belt Co., Ltd.,Vice General Manager of Shanxi Luan Mining Group, Dr. Feng Weimin, General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd. and Mr. Feng Qiang,Administrative General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd.The conference was presided by Vice General Manager Zhu Junhong.……

  5. In Retrospect, Five Year's Splendid Journey of Wind and Rain,Look into the Future, Five Year's Grand Prospect--Shanxi Phoenix Conveyor Belt Co., Ltd.

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ On January 21, 2006, ShanxiPhoenix Conveyor Belt Co.,Ltd. held the 2005 Honor Convention. Those who attended the conference were Mr. Ren Runhou, Board Chairman of Shanxi Phoenix Conveyor Belt Co., Ltd., Board Chairman & General Manager of Shanxi Luan Mining Group, Mr. Shi Wenlin, Director of Shanxi Phoenix Conveyor Belt Co., Ltd.,Vice General Manager of Shanxi Luan Mining Group, Dr. Feng Weimin, General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd. and Mr. Feng Qiang,Administrative General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd.The conference was presided by Vice General Manager Zhu Junhong.

  6. Survival of Listeria monocytogenes on a conveyor belt material with or without antimicrobial additives

    NARCIS (Netherlands)

    Chaitiemwong, N.; Hazeleger, W.C.; Beumer, R.R.

    2010-01-01

    Survival of Listeria monocytogenes on a conveyor belt material with or without antimicrobial additives, in the absence or presence of food debris from meat, fish and vegetables and at temperatures of 10, 25 and 37 °C was investigated. The pathogen survived best at 10 °C, and better at 25 °C than at

  7. New Universal Current-Mode Filter Using Non-Inverting Second-Generation Current-Conveyors

    OpenAIRE

    Muhammad Taher Abuelma'atti; Aamir Alam Farooqui

    1995-01-01

    A new universal active current-mode filter with single input and five outputs is presented. The proposed filter avoids the use of feedback in any part of the circuit and uses only one type of second-generation current-conveyors, grounded resistors, and grounded capacitors. The proposed circuit can simultaneously realize lowpass, highpass, bandpass, allpass, and notch biquadratic filter functions.

  8. N-th Order Filters Using Balanced-Output CCII+/- Conveyors

    Directory of Open Access Journals (Sweden)

    V. Zeman

    1998-09-01

    Full Text Available A novel second-generation current conveyor is defined. A special three-port cell containing the above element is presented. A method for nth-order multifunction circuit realization is described. Two universal networks illustrate the described procedure.

  9. Converter-controlled belt conveyor systems under the difficult conditions; Umrichtergesteuerte Bandanlagen unter schwierigen Bedingungen

    Energy Technology Data Exchange (ETDEWEB)

    Horz, Michael-Josef [RAG Deutsche Steinkohle, Herne (Germany). Abt. Elektrotechnik unter Tage; Mueller, Uwe [RAG Deutsche Steinkohle, Herne (Germany). Servicebereich Technik- und Logistikdienste

    2010-05-15

    Panel 572 is located at a depth of 1,200 m in the Girondelle seam at the West mine. The panel has a mean thickness of 2.5 m and is designed as a shearer loader face with a length of 460 m. Coal is conveyed to the shaft by six belts with a total length of about 6 km and a total lifting height of 396 m. The main conveyor belt 1 with an installed power of 3 MW links the panel to a bunker. Conveyor belts 2 to 4 each with 500 kW drive power have operated in a stable manner since the start of working of the panel. Due to in-seam drivage with a selective-cut machine of type AM 85 an area with a marked trough was produced in the coal conveyor road. This area is traversed by belt 5. The planning and control of the conveyor belt in this difficult geological environment impose high demands on drive and control technology. To ensure stable operation under different loads a raft of measures was resolved and implemented. The contribution examines the problem and describes the implemented measures in detail. (orig.)

  10. Some aspects of the characteristics of vertical screw conveyors for granular material

    NARCIS (Netherlands)

    Rademacher, F.J.C.

    1974-01-01

    A theory has been developed, based on a physical model, to describe the behaviour of non-cohesive granular material inside a vertical screw conveyor. By use of this theory, relationships have been derived between dimensionless numbers for capacity, power consumption and efficiency. These relationshi

  11. Influence of diabatic processes on the PV development in a warm conveyor belt

    Science.gov (United States)

    Joos, H.; Wernli, H.

    2010-09-01

    Warm conveyor belts are frequent features of extratropical cyclones in the Northern Hemisphere. In the strongly ascending airstreams clouds are forming whereas the latent heat release further increases the upward motion. The potential vorticity (PV) in the conveyor belt is strongly influenced by the microphysical processes occurring during the formation of clouds. In general, the PV increases below the maximum diabatic heating and decreases above. Thus, the conveyor belt reaches the upper troposphere with low PV values and therefore has the potential to influence the large scale dynamics. In order to assess the influence of the different microphysical processes like condensation, freezing, evaporation, sublimation, etc. on the PV development during the ascent, a Lagrangian based analysis is used. First, simulations with the COSMO Model are performed in order to calculate the individual diabatic heating rates caused by various transfer processes between hydrometeors. Then, the diabatic heating rates and the associated change in PV are calculated along trajectories in a warm conveyor belt. It can be seen that ice phase processes as well as condensation/evaporation strongly modify the PV during the ascent. Therefore, small scale microphysical processes have the potential to modify the large scale dynamics as airstreams with a strongly modified PV reach the upper troposphere.

  12. Theoretical and experimental investigation on optimization of a non-contact air conveyor

    Institute of Scientific and Technical Information of China (English)

    钟伟; 黎鑫; 陶国良; 路波; 香川利春

    2016-01-01

    Air film conveyors equipped with porous pads have been developed to bring the liquid crystal display (LCD) into a non-contact state during transportation process. In this work, a theoretical model including flow property of porous media and Reynolds equation is established within a representative region in order to optimize the design parameters of a partial porous air conveyor. With the theoretical model, an optimization method using nondominated sorting genetic algorithm – II (NSGA-II) is applied for a two-objective optimization to achieve a minimum air consumption and maximum load capacity. Three Pareto-optimal solutions are selected to analyze the influence of each parameter on the characteristics of the air conveyor, and the results indicate that the position of the porous pads has the most significant impact on the performance and of course must be determined with care. Furthermore, experimental results in terms of the supporting force versus gap clearance show that the optimized air conveyor can greatly improve the load capacity over the normal one, indicating that the optimization method is applicable for practical use.

  13. 长距离带式输送机选型设计%Selection Design of Long Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    王颖; 陶焜

    2015-01-01

    文章介绍了长距离带式输送机的选型设计方法,并依据给定设计参数对输送机的传动滚筒、拉紧装置、输送带以及电控等主要部件进行选型设计。%This paper introduces the selection of long belt conveyor design method, and based on the given design parame-ters on the conveyor drive roller, drives, tensioning device, conveyor belts and so on major components of the selection and design, focusing on the conveyor belt tension analyzed and calculated, and finally gives a reasonable start-up mode and elec-tronically controlled program.

  14. Velocity controller design of a conveyor system in a fish sorting system using modified model reference adaptive control

    National Research Council Canada - National Science Library

    Nguyen, Huy Hung; Duong, Van Tu; Ho Van, Cuu; Kim, Hak Kyeong; Kim, Sang Bong

    2017-01-01

    A modified model reference adaptive controller for velocity control of a conveyor system in a fish sorting system with uncertainty parameters, input saturation and bounded disturbances is proposed in this article...

  15. Control of start-up and dynamic braking of conveyors used for downhill transport in surface mines

    Energy Technology Data Exchange (ETDEWEB)

    Rosseger, A.; Borczyk, Z.; Kwater, M. (POLTEGOR Instytut, Wroclaw (Poland))

    1992-04-01

    Presents the structure of a microprocessor-aided control system for conveyors used in surface mines for downhill transport. Control of motor start-up and braking is performed in 8 speed stages. Permissible starting time duration is taken into consideration. The procedure of direct current braking is described. The microprocessor activates emergency braking by disc brakes if direct current braking is not sufficient. The system was implemented on four conveyors and has been used successfully since 1990.

  16. Design of Online Monitoring and Fault Diagnosis System for Belt Conveyors Based on Wavelet Packet Decomposition and Support Vector Machine

    Directory of Open Access Journals (Sweden)

    Wei Li

    2013-01-01

    Full Text Available Belt conveyors are the equipment widely used in coal mines and other manufacturing factories, whose main components are a number of idlers. The faults of belt conveyors can directly influence the daily production. In this paper, a fault diagnosis method combining wavelet packet decomposition (WPD and support vector machine (SVM is proposed for monitoring belt conveyors with the focus on the detection of idler faults. Since the number of the idlers could be large, one acceleration sensor is applied to gather the vibration signals of several idlers in order to reduce the number of sensors. The vibration signals are decomposed with WPD, and the energy of each frequency band is extracted as the feature. Then, the features are employed to train an SVM to realize the detection of idler faults. The proposed fault diagnosis method is firstly tested on a testbed, and then an online monitoring and fault diagnosis system is designed for belt conveyors. An experiment is also carried out on a belt conveyor in service, and it is verified that the proposed system can locate the position of the faulty idlers with a limited number of sensors, which is important for operating belt conveyors in practices.

  17. Geodetic constraint on the motion of a slab window: Implication for the Mendocino Crustal Conveyor model

    Science.gov (United States)

    Peng, Y.; Dong, D.; Yan, J.; Chen, W.

    2017-07-01

    The migration of the slab window in the Northern California Coast Ranges provides a unique setting to study the viscous coupling between crust and asthenosphere flow. The mechanisms of these dynamic processes are explained by the Mendocino Crustal Conveyor model, which predicts a 2-D "double-humped" surface uplift rate pattern on a 400 km long profile. To evaluate the Mendocino Crustal Conveyor (MCC) model using accurate geodetic measurements, we derive the vertical velocity field from 43 continuous GPS (CGPS) stations in the Coast Ranges region and project it onto the profile along three possible orientations of the slab window. The CGPS measured uplift rates are in good agreement with the MCC prediction, when the slab window orientation is parallel to the symmetry axis of the region of thickened crust. Thus, the CGPS solutions not only provide a complementary means to diagnose the MCC model but also provide an effective way to constrain the orientation of the slab window.

  18. INFLUENCE CONSTRUCTION OF THE ROLLER ON THE POWER OF THE DRIVE SYSTEM OF THE BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    Tadeusz OPASIAK

    2014-09-01

    Full Text Available The paper presents a study of new design of rollers. The study focused on the measurement of static and dynamic resistance of rotating rollers and the impact of new construction on the power consumption of the belt conveyor. Rollers have been modified through the use of class C4 bearing seals and labyrinth seal U4Exp 62/65 with a cover 2LU4 of runner construction. Measurements of static and dynamic resistance of rotating rollers were made on a universal rollers stand and power measurements were carried out on a belt conveyor power supply system Gwarek 1200 No. TW in mine KWK Mysłowice–Wesoła.

  19. Modeling a magneto-rheological soft starter for use with belt conveyors

    Institute of Scientific and Technical Information of China (English)

    Tian Zuzhi; Hou Youfu

    2012-01-01

    The theory of magnetic circuit design,the constitutive equations of a magneto-rheological fluid,and the load properties of belt conveyors were used to design a magneto-rheological soft starter test-bed.The magnetic field distribution in the working gap was analyzed and the current-speed relationship was investigated.A mathematical model for the time response was deduced.The results show that a linear relationship between current and magnetic field is seen when the magnetic materials are not saturated and the magnetic field is uniform in the working section.The rotation speed of the driven shaft changes linearly with increasing time.The response is rapid and can be as short as milliseconds.This meets the starting requirements of belt conveyors.

  20. Dynamics simulation of the belt conveyor possessing feedback loop during starting

    Institute of Scientific and Technical Information of China (English)

    XI Ping-yuan; ZHANG Hai-tao; LIU Jun

    2005-01-01

    Synthesizing the mechanical models of the belt, the driver and the take-up device, the dynamics model was established on the longitudinal vibration of the overall belt conveyor system with finite elemental method, and S-function simulation block of asynchronous motor owing feedback function was built in Matlab/Simulink software, the simulation block indicates that motor rotation speed and its output moment vary with load and time, and the motor is a dynamic feedback system in working process. The state space block was adopted to express model of the belt. Thus it created simulation model of established dynamic model of overall belt conveyor system with Matlab/Simulink software, and simulates the course of starting by properly setting simulation parameters, and processes data for visualization.

  1. Design Considerations for CMOS Current Mode Operational Amplifiers and Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    This dissertation is about CMOS current conveyors and current mode operational amplifiers (opamps). They are generic devices for continuous time signal processing in circuits and systems where signals are represented by currents.Substantial advancements are reported in the dissertation, both...... related to circuit implementations and system configurations and to an analysis of the fundamental limitations of the current mode technique.In the field of system configurations and circuit implementations different configurations of high gain current opamps are introduced and some of the first...... implementations of current mode opamps in CMOS technology are described. Also, current conveyor configurations with multiple outputs and flexible feedback connections from outputs to inputs are introduced. The dissertation includes several examples of circuit configurations ranging from simple class A and class...

  2. Possibilities for utilizing scrap rubber conveyor belts in manufacturing mine cars

    Energy Technology Data Exchange (ETDEWEB)

    Owinski, A.; Furmanik, K.

    1985-01-01

    Utilization of scrap conveyor belts removed due to wear in manufacturing mine cars used in underground coal mines is evaluated. Tests show that rubber packs (sandwiches) consisting of conveyor belt elements successfully replace springing in mine cars. The rubber packs are bent at an angle of 90 or 120 degrees to increase their damping properties. Evaluations show that service life of rubber springing is longer than 3 years. Replacing steel springs in car buffers with rubber belt packs is a further possibility. The rubber packs in car buffers absorb up to 35% of shock energy. Sections of scrap belts could also be used to reduce buildup of coal in mine cars. Belt sections are fastened to the bottom of mine cars. Belt deformation during car self-dumping (or unloading in a rotary tippler) reduces coal adhesion to the car body and prevents buildup. 4 references.

  3. Modelling and control algorithms of the cross conveyors line with multiengine variable speed drives

    Science.gov (United States)

    Cheremushkina, M. S.; Baburin, S. V.

    2017-02-01

    The paper deals with the actual problem of developing the control algorithm that meets the technical requirements of the mine belt conveyors, and enables energy and resource savings taking into account a random sort of traffic. The most effective method of solution of these tasks is the construction of control systems with the use of variable speed drives for asynchronous motors. The authors designed the mathematical model of the system ‘variable speed multiengine drive – conveyor – control system of conveyors’ that takes into account the dynamic processes occurring in the elements of the transport system, provides an assessment of the energy efficiency of application the developed algorithms, which allows one to reduce the dynamic overload in the belt to 15-20%.

  4. Using the classical linear regression model in analysis of the dependences of conveyor belt life

    Directory of Open Access Journals (Sweden)

    Miriam Andrejiová

    2013-12-01

    Full Text Available The paper deals with the classical linear regression model of the dependence of conveyor belt life on some selected parameters: thickness of paint layer, width and length of the belt, conveyor speed and quantity of transported material. The first part of the article is about regression model design, point and interval estimation of parameters, verification of statistical significance of the model, and about the parameters of the proposed regression model. The second part of the article deals with identification of influential and extreme values that can have an impact on estimation of regression model parameters. The third part focuses on assumptions of the classical regression model, i.e. on verification of independence assumptions, normality and homoscedasticity of residuals.

  5. System for conveyor belt part picking using structured light and 3D pose estimation

    Science.gov (United States)

    Thielemann, J.; Skotheim, Ø.; Nygaard, J. O.; Vollset, T.

    2009-01-01

    Automatic picking of parts is an important challenge to solve within factory automation, because it can remove tedious manual work and save labor costs. One such application involves parts that arrive with random position and orientation on a conveyor belt. The parts should be picked off the conveyor belt and placed systematically into bins. We describe a system that consists of a structured light instrument for capturing 3D data and robust methods for aligning an input 3D template with a 3D image of the scene. The method uses general and robust pre-processing steps based on geometric primitives that allow the well-known Iterative Closest Point algorithm to converge quickly and robustly to the correct solution. The method has been demonstrated for localization of car parts with random position and orientation. We believe that the method is applicable for a wide range of industrial automation problems where precise localization of 3D objects in a scene is needed.

  6. Singularity Detection of Magnetic Memory Signal of Steel-Cord Conveyor Belt

    Directory of Open Access Journals (Sweden)

    Qiao Tiezhu

    2013-09-01

    Full Text Available Metal magnetic memory technology was an important method for detecting the steel-cord conveyor belt early fault, characteristics of magnetic memory signal extraction is critical for judging of the conveyor belt failure. Generally using of magnetic memory signal maximum gradient value can quickly judge the stress concentration zone, but the magnetic memory signal is susceptible to effected by environmental and noise; In view of the weak and non-stationary characteristics of magnetic memory signal, this paper has proposed the singularity detection method based on wavelet transform modulus maximum for metal magnetic memory signal, the method could exactly judged the stress concentration zone of joints and located the fault points of the steel-cord belt, the characteristic gradient of magnetic memory signal and the Lipschitz exponent were extracted. The result of simulation indicated the technology was effectively for judging the stress concentration zone and fault point. ��

  7. Biquads Based on Single Negative Impedance Converter Implemented by Classical Current Conveyor

    Directory of Open Access Journals (Sweden)

    V. Axman

    2007-09-01

    Full Text Available The paper deals with continuous-time ARC biquadratic (second-order filters based on the single classical three-port current conveyors, so called second generation CC II. A unique application of the CC II is discussed, when the terminals Y and Z are connected together. Using this way a negative impedance converter is obtained as a suitable building block in synthesis of several biquads, including notch filters.

  8. Realization of Nth-Order Voltage Transfer Function using Current Conveyors CCII

    Directory of Open Access Journals (Sweden)

    K. Vrba

    1997-06-01

    Full Text Available A universal method for the realization of arbitrary voltage transfer function in canonic form is presented. A voltage-controlled current-source using a plus-type second-generation current conveyor is here applied as the basic building element. Filters designed according to this method have a high input impedance and low sensitivity to variations of circuit parameters. All passive elements are grounded.

  9. Varying the uphill and downhill speeds of the shearer loader and of the face conveyor

    Energy Technology Data Exchange (ETDEWEB)

    Husz, N.

    1978-01-01

    Utilization of the production capacity attainable by the suitable variation of the speed of the hauling chain of both the shearer loader and the face of the conveyor has been subjected to study. The results which can be reached by applying the coal falling length equalization method are shown as well as the utilization of the conveying capacity for the case when the seam is cut in two slices in the face height ie in two benches.

  10. Voltage-Mode Multifunction Biquadratic Filters Using New Ultra-Low-Power Differential Difference Current Conveyors

    Directory of Open Access Journals (Sweden)

    M. Kumngern

    2013-06-01

    Full Text Available This paper presents two low-power voltage-mode multifunction biquadratic filters using differential difference current conveyors. Each proposed circuit employs three differential difference current conveyors, two grounded capacitors and two grounded resistors. The low-voltage ultra-low-power differential difference current conveyor is used to provide low-power consumption of the proposed filters. By appropriately connecting the input and output terminals, the proposed filters can provide low-pass, band-pass, high-pass, band-stop and all-pass voltage responses at high-input terminals, which is a desirable feature for voltage-mode operations. The natural frequency and the quality factor can be orthogonally set by adjusting the circuit components. For realizing all the filter responses, no inverting-type input signal requirements as well as no component-matching conditional requirements are imposed. The incremental parameter sensitivities are also low. The characteristics of the proposed circuits are simulated by using PSPICE simulators to confirm the presented theory.

  11. Impact of Selected Parameters on the Fatigue Strength of Splices on Multiply Textile Conveyor Belts

    Science.gov (United States)

    Bajda, Mirosław; Błażej, Ryszard; Hardygóra, Monika

    2016-10-01

    Splices are the weakest points in the conveyor belt loop. The strength of these joints, and thus their design as well as the method and quality of splicing, determine the strength of the whole conveyor belt loop. A special zone in a splice exists, where the stresses in the adjacent plies or cables differ considerably from each other. This results in differences in the elongation of these elements and in additional shearing stresses in the rubber layer. The strength of the joints depends on several factors, among others on the parameters of the joined belt, on the connecting layer and the technology of joining, as well as on the materials used to make the joint. The strength of the joint constitutes a criterion for the selection of a belt suitable for the operating conditions, and therefore methods of testing such joints are of great importance. This paper presents the method of testing fatigue strength of splices made on multi-ply textile conveyor belts and the results of these studies.

  12. Minimising the fire hazard from the use of belt conveyors in intake roadways

    Energy Technology Data Exchange (ETDEWEB)

    Leeming, J.R. [Health and Safety Executive, Sheffield, S. Yorkshire (United Kingdom)

    2010-07-01

    The fire that occurred a the Creswell underground coal mine in Derbyshire in 1950 in which 90 miners lost their lives was caused by a damaged rubber conveyor belt that ignited after being friction heated. The fire propagated along the intake trunk roadway by the burning belt itself, which ignited the timber roadway supports and hampered fire-fighting efforts. This paper demonstrated that operating conveyors in intake trunk roadways presents a risk that products of combustion can be carried to the working areas of a mine via ventilation pathways, thus creating a hazard to the underground miners. In North America, the use of belt air is not commonly used to ventilate working areas. However, these arrangements are common in the United Kingdom. As such, installation, inspection and maintenance standards have been created to minimize the risk of fire in underground, remotely operated belt conveyors in underground mines. Monitoring systems are also in place for early detection of any fire. A review of recent underground fires in the United Kingdom has shown that the measures adopted have been successful in avoiding uncontrollable fires. 13 refs., 5 figs.

  13. Minimum Configuration Insensitive Multifunctional Current-Mode Biquad Using Current Conveyors and All-Grounded Passive Components

    Directory of Open Access Journals (Sweden)

    W. Chunhua

    2010-04-01

    Full Text Available This paper proposes a new current conveyorbased high-output impedance single-input three-output current mode filter with minimum configuration. It contains two dual output second generation current conveyors, one third generation dual output current conveyor, and four grounded resistors and capacitors. The circuit simultaneously provides low-pass, band-pass, and high-pass filtering outputs, without any passive component matching conditions and restrictions on input signals. Additionally, the proposed circuit offers following advantages: Minimum active and passive element count, high output and low input impedances, suitable for cascading identical currentmode sections, all passive elements are grounded (no virtual grounding, low natural frequency and Q-factor sensitivities. The influences of non-ideal current conveyors on the proposed circuit are researched in the last.

  14. Research of x-ray nondestructive detector for high-speed running conveyor belt with steel wire ropes

    Science.gov (United States)

    Wang, Junfeng; Miao, Changyun; Wang, Wei; Lu, Xiaocui

    2008-03-01

    An X-ray nondestructive detector for high-speed running conveyor belt with steel wire ropes is researched in the paper. The principle of X-ray nondestructive testing (NDT) is analyzed, the general scheme of the X-ray nondestructive testing system is proposed, and the nondestructive detector for high-speed running conveyor belt with steel wire ropes is developed. The hardware of system is designed with Xilinx's VIRTEX-4 FPGA that embeds PowerPC and MAC IP core, and its network communication software based on TCP/IP protocol is programmed by loading LwIP to PowerPC. The nondestructive testing of high-speed conveyor belt with steel wire ropes and network transfer function are implemented. It is a strong real-time system with rapid scanning speed, high reliability and remotely nondestructive testing function. The nondestructive detector can be applied to the detection of product line in industry.

  15. 煤矿井下带式输送机驱动系统浅析%Analysis of Driving System for Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    张志飞

    2015-01-01

    文章通过对输送机驱动系统的讨论比较,给出了不同驱动方式的优缺点,并对变频控制技术及电动滚筒驱动的带式输送机的发展前景进行了展望,为煤矿井下皮带输送机驱动系统合理选型提供支撑。%Belt conveyor in coal mine got a lot of applications,Through the discussion of the conveyor drive system,the paper presented the advantages and disadvantages of different driving modes,And prospected the development of the belt conveyor of frequency control technology and electric drum-driven conveyor,it procide support for a reasonable selection of drive system of coal mine belt conveyor.

  16. Event Driven Control of Vibratory Conveyors Operating on the Frahm's Eliminator Basis

    Directory of Open Access Journals (Sweden)

    Klemiato M.

    2015-04-01

    Full Text Available The new, original control method of the vibratory conveyor operating on the Frahm's dynamic eliminator basis, is presented in the paper. The proposed method is based on the application of the control of the feed-forward controler, together with the events detection based on the generalised likelihood ratio (GLR algorithm. Such approach leads to the controller intervention only when it is justified by the current process situation, (e.g. in case of an essential change of the feed mass to enable the stable machine operations and to limit transient states. The results are presented in a form of numerical simulations.

  17. Use of computational fluid dynamics simulations for design of a pretreatment screw conveyor reactor.

    Science.gov (United States)

    Berson, R Eric; Hanley, Thomas R

    2005-01-01

    Computational fluid dynamics simulations were employed to compare performance of various designs of a pretreatment screw conveyor reactor. The reactor consisted of a vertical screw used to create cross flow between the upward conveying solids and the downward flow of acid. Simulations were performed with the original screw design and a modified design in which the upper flights of the screw were removed. Results of the simulations show visually that the modified design provided favorable plug flow behavior within the reactor. Pressure drop across the length of the reactor without the upper screws in place was predicted by the simulations to be 5 vs 40 kPa for the original design.

  18. THE HARMONIZATION AND OPTIMIZATION OF DIAGNOSTIC METHODS FOR A BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    František HELEBRANT

    2012-04-01

    Full Text Available The final aim of the project MPO FR‐T11/537 called “The Complex Diagnostic System for the Belt Transport” is a single part custom manufacturing and sale of complex diagnostic system for belt transportation and related services. The output of the project is a prototype of a diagnostic system on a model belt conveyor with prepared and certified diagnostic services and methods including their measurements and other supportive tools. The article will introduce the present state of the solution for the given grant project, especially in the field of suggested work on the diagnostic and supportive methods and other measurements.

  19. Movement analysis on steel wire rope of continuous conveyor with disc-tube assembly

    Institute of Scientific and Technical Information of China (English)

    LUAN Li-jun; SHI Shu-lin; REN Li-yi

    2004-01-01

    The steel wire rope of continuous conveyor with disc-tube assembly is droved by the driving wheel. When the driving wheel rotates, the gear is combined to the connection disc in turn, promoting the connection disc to move in succession. Turning the whirling torque of driving wheel into the straight-line traction force. When the steel wire rope is winded by the driving wheel some winded along the circumference, others winded along the straight line. Used motion subject law, this article analyses the change of the velocity and the acceleration of the steel wire rope in the straight movement, and observe the mathematics' model of velocity and acceleration.

  20. 一种螺旋输送机的改进设计%An Improved Design of the Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    左章华

    2014-01-01

    通过一次闲置的螺旋输送机改造过程,叙述了螺旋输送机改造中需要注意的几个相关事项,并对螺旋输送机现场改造中涉及到的问题提出了相应的解决办法。%In this paper ,through the transformation process of an idle screw conveyor ,describes several re-lated issues that need attention on the transformation of the screw conveyor , and on-site issues related to this transformation,here advance a corresponding solution .

  1. Surveying the face head advance rate and the face conveyor position. Ueberwachung des Strebfrontverlaufs und der Lage von Strebfoerdermitteln

    Energy Technology Data Exchange (ETDEWEB)

    1975-01-01

    For a constant monitoring of the face work and the position of the face conveyor, continuous surveying of the conveyor systems is required. This publication of the Steinkohlenbergbauverein describes two well-established surveying techniques using either a folding rule or a tape measure or advance rate meter. The latter is described with regard to its design and functions. Both methods are quasisteady methods which can be carried out by the working staff or by the foreman without disturbing operations and with hardly any loss of time. (MOS).

  2. Computational fluid dynamics simulation and redesign of a screw conveyor reactor.

    Science.gov (United States)

    Wan, Yinkun; Hanley, Thomas R

    2004-01-01

    National Renewable Energy Laboratory (NREL) designed a shrinking-bed reactor to maintain a constant bulk packing density of cellulosic biomass. The high solid-to-liquid ratio in the pretreatment process allows a high sugar yield and avoids the need to flush large volumes of solution through the reactor. To scale up the shrinking-bed reactor, NREL investigated a pilot-scale screw conveyor reactor in which an interrupted flight between screws was employed to mimic the "shrinking-bed" effect. In the experiments with the screw conveyor reactor, overmixing and uneven flow occurred. These phenomena produce negative effects on biomass hydrolysis. The flow behavior inside the reactor was analyzed to allow redesign of the screw to achieve adequate mixing and even flow. In the present study, computational fluid dynamics (CFD) was utilized to simulate the fluid flow in the porous media, and a new screw design was proposed. CFD analysis performed on the redesigned reactor indicated that an even flow pattern was achieved.

  3. Numerical evaluation of turbulence models for dense to dilute gas-solid flows in vertical conveyor

    Institute of Scientific and Technical Information of China (English)

    Salar Azizi; Dariush Mowla; Goodarz Ahmadi

    2012-01-01

    A two-fluid model (TFM) of multiphase flows based on the kinetic theory and small frictional limit boundary condition of granular flow was used to study the behavior of dense to dilute gas-solid flows in vertical pneumatic conveyor.An axisymmetric 2-dimensional,vertical pipe with 5.6 m length and 0.01 m internal diameter was chosen as the computation domain,same to that used for experimentation in the literature.The chosen particles are spherical,of diameter 1.91 mm and density 2500 kg/m3.Turbulence interaction between the gas and particle phases was investigated by Simonin's and Ahmadi's models and their numerical results were validated for dilute to dense conveying of particles.Flow regimes transition and pressure drop were predicted.Voidage and velocity profiles of each phase were calculated in radial direction at different lengths of the conveying pipe.It was found that the voidage has a minimum,and gas and solid velocities have maximum values along the center line of the conveying pipe and pressure drop has a minimum value in transition from dense slugging to dilute stable flow regime.Slug length and pressure fluctuation reduction were predicted with increasing gas velocity,too.It is shown that solid phase turbulence plays a significant role in numerical prediction of hydrodynamics of conveyor and the capability of particles turbulence models depends on tuning parameters of slip-wall boundary condition.

  4. Análisis estructural de un transportador de banda. // Structural analysis of a band conveyor.

    Directory of Open Access Journals (Sweden)

    P. Alvarez Barreras

    2001-07-01

    Full Text Available El presente trabajo contiene el análisis de comprobación de la estructura de la cuna de una máquina transportadora debanda. En el mismo se determinan las cargas de servicio y las condiciones de apoyo, se efectúa el cálculo lineal por elmétodo de los elementos finitos, y finalmente se valoran los resultados en forma de:· Análisis de las tensiones.· Análisis de los desplazamientos.· Análisis de las deformaciones.Palabras claves: Transportador de banda, estructura, análisis de tensiones, elementos finitos.________________________________________________________________________________AbstractThe present work contains the structure analysis of a belt conveyor cradle. The operation loads and conditions of supportare determined, the lineal calculation is made by the Finite Element Method, and finally the results are valued in form of:· Analysis of tensions.· Analysis of displacements.· Analysis of deformations.Key words: Belt conveyor cradle, structure, tension analysis, finite element.

  5. Transport of stone material by conveyor belt. Transporte de materiales rocosos por cintas transportadoras

    Energy Technology Data Exchange (ETDEWEB)

    Herranz Villafruela, F. (Lignitos de Meirama S.A., La Coruna (Spain))

    1990-04-01

    During one of the phases of the project (1976) to extract the brown lignite discovered in the Meirama valley (La Coruna) by opencast mining, it was decided, for economic reasons, to transport shale to the spoil tips by conveyor belts. Working on the basis of entirely theoretical data, for want of experience in this field, this waste stone material was crushed as near as possible to the working face in order to make it small enough to be transported by the general conveyor belt system. For this purpose, a semi-mobile crushing unit was selected which advances by means of a hydraulic platform mounted on caterpillar tracks. After several years of operation in the mining environment with what at the beginning was a totally new method, it can be confirmed that a saving has been made in the cost of transporting waste material compared to the use of dumper trucks and their two main cost elements - energy and spare parts. 4 figs., 2 tabs.

  6. New equipment for shifting belt conveyors and rails of basic mining machines

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1977-07-01

    Notes that equipment used in the Polish brown coal surface mines for shifting belt conveyors and rail tracks is easily damaged, particularly under difficult mining conditions in autumn and spring. After the difficult season 1974-1975 the Poltegor Project Center investigated the possibility of constructing new equipment for shifting rails and belt conveyors. In January 1976 the first three prototypes of the PP-12 shifting machine, installed on the DET-250 tractor (produced in GDR), and with GP-12 type grab, were produced. The first tests of PP-12 machines in brown coal surface mines under difficult conditions were positive. The amount of damage decreased, wear of parts also decreased, fuel consumption fell and efficiency of the shifting machines increased. The price of one GP-12 grab produced according to plans developed by Poltegor is 4 times lower than price of the grab imported from FRG (produced by Krupp). Detailed technical specifications of the PP-12 shifting machine as well as the GP-12 grab are given. (In Polish)

  7. On the weakly nonlinear, transversal vibrations of a conveyor belt with a low and time-varying velocity

    NARCIS (Netherlands)

    Suweken, G.; van Horssen, W.T.

    2002-01-01

    In this paper the weakly nonlinear, transversal vibrations of a conveyor belt will be considered. The belt is assumed to move with a low and time-varying speed. Using Kirchhoff's approach a single equation of motion will be derived from a coupled system of partial differential equations describing

  8. Beyond Accidents: A Back-Analysis on Conveyor Belt Injury for a Better Design for Maintenance Operations

    NARCIS (Netherlands)

    Martinetti, Alberto; van Dongen, Leonardus Adriana Maria; Romano, Raffaele

    2016-01-01

    The conveyor belt represents one of the most commonly used methods of transporting bulk materials today. As highlighted multiple times in research, the moving parts are a critical issue causing accidents and injuries and several of these are strictly related to the opportunity to enter in working

  9. 30 CFR 75.1101 - Deluge-type water sprays, foam generators; main and secondary belt-conveyor drives.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Deluge-type water sprays, foam generators; main and secondary belt-conveyor drives. 75.1101 Section 75.1101 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES Fire Protection §...

  10. FLUID-BASED SIMULATION APPROACH FOR HIGH VOLUME CONVEYOR TRANSPORTATION SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    Ying WANG; Chen ZHOU

    2004-01-01

    High volume conveyor systems in distribution centers have very large footprint and can handle large volumes and hold thousands of items. Traditional discrete-event cell-based approach to simulate such networks becomes computationally challenging. An alternative approach, in which the traffic is represented by segments of fluid flow of different density instead of individual packages, is presented in this paper to address this challenge. The proposed fluid-based simulation approach is developed using a Hybrid Petri Nets framework. The underlying model is a combination of an extension of a Batches Petri Nets (BPN) and a Stochastic Petri Nets (SPN). The extensions are in the inclusion of random elements and relaxation of certain structural constraints. Some adaptations are also made to fit the target system modeling. The approach is presented with an example.

  11. A New Application of Current Conveyors: The Design of Wideband Controllable Low-Noise Amplifiers

    Directory of Open Access Journals (Sweden)

    A. Fabre

    2008-12-01

    Full Text Available The aim of this paper is three-fold. First, it reviews the low-noise amplifier and its relevance in wireless communications receivers. Then it presents an exhaustive review of the existing topologies. Finally, it introduces a new class of LNAs, based on current conveyors, describing the founding principle and the performances of a new single-ended LNA. The new LNAs offer the following notable advantages: total absence of passive elements (and the smallest LNAs in their respective classes; wideband performance, with stable frequency responses from 0 to 3 GHz; easy gain control over wide ranges (0 to 20 dB. Comparisons with other topologies prove that the new class of LNA greatly advances the state of the art.

  12. A New Current Mode SIMO-Type Universal Biquad Employing Multi-Output Current Conveyors (MOCCIIs

    Directory of Open Access Journals (Sweden)

    S. Du

    2009-04-01

    Full Text Available This study presents a new current-mode singleinput and multi-output (SIMO type universal biquad circuit using second generation multi-output current conveyors (MOCCII as the active components. The proposed circuit employs three MOCCIIs, two grounded capacitors and four grounded resistors, therefore offers electroning tuning possibilities. It can simultaneously realize second order low-pass, band-pass, high-pass, notch and all-pass filters. The circuit is cascadable and has low sensitivities. It provides independent control of ω0 (natural angular frequency and Q (quality factor. The influences of MOCCII parasitic elements have been analyzed and simulated using PSPICE. Experimental results including frequency responses of low-pass, high-pass, band-pass and band-stop filters, as well as frequency responses of filters with different ω0 (keeping Q invariable and different Q (keeping ω0 invariable are shown to be in agreement with theory.

  13. Noise in Load Cell Signal in an Automatic Weighing System Based on a Belt Conveyor

    Directory of Open Access Journals (Sweden)

    Kyoo Nam Choi

    2017-01-01

    Full Text Available Noise in load cell signal in an automatic weighing system based on a belt conveyor has been examined experimentally in time and frequency domains to enhance signal quality. The noise frequency spectrum showed nonlinearly increasing multiple resonance peaks as speed increased. The noise reduction process using noise reduction algorithm, by sharply rejecting peak noise frequency component and afterward forming optimum pulse width ratio through filter slope control using selective switching of 6 LPF stages, was used for enhanced accuracy. The effectiveness of proposed method, controlling both cutoff frequency and slope of LPF, was evaluated by feeding 50 g test mass, and this noise reduction process showed better noise filtering with enhanced accuracy than fixed cutoff frequency control method. The ratio of top to bottom pulse width showed that LPF cutoff frequency above 5 Hz had the ratio above 50% up to 80 m/min speed range.

  14. Efficient method for storage of long conveyor belts passages inside the bulk containers

    Directory of Open Access Journals (Sweden)

    Maria ŁUSZCZKIEWICZ-PIĄTEK

    2011-01-01

    Full Text Available The paper introduces the family of the algorithms designed to improve the process of winding up the long conveyor belt passages on reels located inside the bulk containers, used for i.e. rail transport. The proposed method provides the convenient storage technique of the long belt passages , enabling their transport on the standardized rail wagons. Presented solution also addresses the problems related with binding the smaller belt passages, such as shorter life span in comparison to the single-part belt. Moreover, the presented work contains not only the details of the two algorithms representative for the proposed method, but also the outlook of the system of the automatic control required for the successful application of the proposed technique.

  15. Reinforcing materials in conveyor belts: their requirements and developments; Verstaerkungsmaterialien in Foerdergurten: Tendenzen, Anforderungen und Entwicklungen

    Energy Technology Data Exchange (ETDEWEB)

    Kopmels, P. [Akzo Nobel Fibers, Arnhem (Netherlands)

    1994-12-31

    During this century one can observe a gradual change in the textile materials used to reinforce conveyor belt. In the beginning of the 20th century only cotton was used, then rayon came up followed by polyamide and polyester. Nowadays aramid is also used for special applications. These changes in textile reinforcing materials were driven by a better fulfilment of the existing technical requirements and/or a better price/performance ratio. In addition to the search for new polymers, the fiber producers try to improve the yarn properties of existing polymers. An example of a newly developed polyester type is presented. By raising the yarn strength and at the same time improving the efficiency of the yarn in respect to the necessary converting steps like twisting, weaving and dipping the price/performance ratio of this new yarn type has been greatly improved. 11 figs.

  16. STUDY ON THE CONTROL SYSTEM OF HYDRAULIC MOMENT-ADJUSTED BRAKE FOR DOWNWARD BELT CONVEYOR

    Institute of Scientific and Technical Information of China (English)

    孟国营; 徐志强; 霍森; 方佳雨

    1997-01-01

    Having analyzed the drawbacks on the design of control system of hydraulic momentadjusted brake system, the author presents a closed loop control system in the process of start and braking of the conveyer. On the basis of the concept of the critical time and the critical acceleration and its deductions, the working mode of the conveyer can be identified and controlled in feedback, furthermore, thus realize the process of soft start. In the deceleration process, the author points out the problems that exist in the present control system and sets forward the control process that acted by the combined function of brake moment of motor and the drag torque of hydraulic brake at the beginning of deceleration, it will further improved reliability of conveyor system.

  17. Transient Torsional Analysis of a Belt Conveyor Drive with Pneumatic Flexible Shaft Coupling

    Directory of Open Access Journals (Sweden)

    Kaššay Peter

    2017-03-01

    Full Text Available Development and application of pneumatic flexible shaft couplings have been in the center of our department research activities for a long time. These couplings are able to change torsional stiffness by changing pressure in their flexible elements – air bellows. Until now we have dealt with the use of pneumatic flexible shaft couplings for tuning mechanical systems working with periodically alternating load torque at steady state. Some mechanical systems, however, operate with a static load torque at constant speed (e.g. hoists, elevators, etc., where it is necessary to consider the suitability of shaft coupling in terms of load torque at transient conditions (run-up and braking. Therefore we decided to analyze the use of pneumatic flexible shaft couplings also in this type of mechanical systems on an example of conveyor belt drive.

  18. Application of Inverter in Belt Conveyor Control%变频器在带式输送机上的控制应用

    Institute of Scientific and Technical Information of China (English)

    李芬

    2015-01-01

    The article describes the traditional driving way of belt conveyor ,focusing on the application of inverter in belt conveyor control ,and the advantages of the frequency control .%介绍了带式输送机的传统驱动方式,重点论述了变频器对带式输送机的控制,以及变频控制的优势。

  19. 螺旋输送装置的研究现状及未来发展%Present Situation and Future Development of Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光

    2014-01-01

    Screw conveyor becoming increasingly prevalent in a variety of industries , therefore it ’ s required higher per-formance .Study in screw conveyor is significant for implementing mechanization and automation of conveyors .This paper introduces the present situations of screw conveyors at home and abroad , elabrates the main problems in the development of the screw conveyors in our countries , and points out the development tendency , provides theory basis for the develop-ment of screw conveyors .%随着螺旋输送装置在多种行业中的应用日益扩大,对其性能要求也越来越高,因而对输送装置进行深入研究,对我国输送机械化和自动化具有现实意义。为此,对国内外螺旋输送装置的理论分析、设计制造及仿真研究进行综述,分析了目前螺旋输送装置存在的主要问题,探讨了今后研究方向。

  20. Selección de cadenas para equipos de transporte continuo. // Chain selection software for continuous conveyors.

    Directory of Open Access Journals (Sweden)

    F. Aguilar Parés

    2003-01-01

    ón, transportadores de tablillas, transportadores de rastrillos,elevadores de cangilones._____________________________________________________________________________Abstract:The design of conveyors and elevators that employ chains as driving member is commonly used in industry. An essentialelement for well functioning is the correct chain selection. There are a great variety of chains and attachments thataccomplish any requirements at manufacturers disposal. In order to supply these requirements there is a need to establish aprocedure that considers the following aspects:· Type of equipment (slat conveyor, flight conveyor, bucket conveyor, etc..· Transportation requirements (capacity, transportation velocity, material characteristics, etc..· Transportation conditions (overload, operation conditions, explotation time, etc..The resulting procedure is very annoying because there are stages in which a decision implies accommodation to latecalculations and as usual there is more than one solution. Therefore the SELCAD computation program is conceived for theuse by non experts in design and selection of continuous conveyors equipments. The program use data base from Link BeltIndustrial Chain Division catalog in which 14 types of chains are appraise with an average of 15 models for each and morethan 40 different attachments. Some of the program characteristics are:· User friendly environment (Visual Basic programation, version 5.· Help available at any moment.· Point out the characteristics of both driving member and gear.· Allows visualization of the selected real chain shape and attachment by photos.· Quick analysis of different variations.Key words: Transportation chain, slat conveyors, flight conveyor, bucket conveyor.

  1. ANALYSIS OF MOVEMENT RESISTANCE OF CONVEYOR BELT AND ROLLERS IN THE COAL MINE MYSŁOWICE-WESOŁA

    Directory of Open Access Journals (Sweden)

    Tadeusz OPASIAK

    2014-03-01

    Full Text Available The paper presents a study of new design of SAG rollers. The study focused on the measurement of static and dynamic resistance of rotating rollers and the impact of new construction on the power consumption of the conveyor. Rollers have been modified through the use of class C4 bearing seals and labyrinth seal U4Exp 62/65 with a cover 2LU4 of runner construction. Measurements of static and dynamic resistance of rotating rollers were made on a universal rollers test bench, and power measurements were carried out on a belt conveyor power supply system Gwarek 1200 No. TW in KWK Mysłowice-Wesoła

  2. 输送带水冲洗系统的设计%Design of water flushing system for conveyor belt

    Institute of Scientific and Technical Information of China (English)

    张艳明

    2012-01-01

    针对带式输送机输送带回程段存在的粘料问题,采用水冲洗装置,解决了原刮料器刮不干净的问题.该系统实际运行效果良好,对输送机的维护具有一定的指导意义.%Aiming at the stuck material existing in the return section of conveyor belt, water flushing system is adopted in order to solve the problem that the original scraper fails to scrap it off totally. The system proves a great operation effect. This paper provides certain guidance to maintenance of the conveyor as well.

  3. A new conveyor system based on a passive magnetic levitation unit having repulsive-type magnetic bearings

    Science.gov (United States)

    Ohji, T.; Ichiyama, S.; Amei, K.; Sakui, M.; Yamada, S.

    2004-05-01

    A magnetic repulsive-type conveyor system is proposed as a new application of repulsive-type magnetic bearings, which use repulsive forces between the stator and rotor permanent magnets. The proposed conveyer is composed by aligning many passive magnetic levitation units. Each unit also contains electromagnets to oscillate a levitator shaft in the radial direction. The way of generating vibration and rotation in the conveyance direction was examined by the various excitation methods.

  4. Determination of Effective Factors on Power Requirement and Conveying Capacity of a Screw Conveyor under Three Paddy Grain Varieties

    Directory of Open Access Journals (Sweden)

    Ezzatollah Askari Asli-Ardeh

    2012-01-01

    Full Text Available An experiment was conducted to investigate the effect of screw speed, inclination angle and variety on the required power, and conveying capacity of a screw conveyor. The experiment was designed with four levels of screw speed (600, 800, 1000, and 1200 rpm, five levels of inclination angle (0, 20, 40, 60, and 80∘, and three levels of variety (Alikazemi, Hashemi, and Khazar. The Length, diameter, and pitch of screw were 2, 0.78, and 0.5 m, respectively. The experimental design was a randomized complete block (RCB with factorial layout. Maximum and minimum power requirements of tested screw conveyor were 99.29 and 81.16 Watt corresponding to conveying capacity of 3.210 and 1.975 ton/hour obtained for khazar and Alikazemi varieties, respectively. The results indicated that as screw inclination angle increased from 0 to 80∘, the conveying capacity decreased significantly from 3.581 to 0.932 t/h. It can be concluded that the most conveying capacity was 4.955 t/h at tests with khazar variety and conveyor inclination angle zero degree.

  5. Determination of effective factors on power requirement and conveying capacity of a screw conveyor under three paddy grain varieties.

    Science.gov (United States)

    Askari Asli-Ardeh, Ezzatollah; Mohsenimanesh, Ahmad

    2012-01-01

    An experiment was conducted to investigate the effect of screw speed, inclination angle and variety on the required power, and conveying capacity of a screw conveyor. The experiment was designed with four levels of screw speed (600, 800, 1000, and 1200 rpm), five levels of inclination angle (0, 20, 40, 60, and 80°), and three levels of variety (Alikazemi, Hashemi, and Khazar). The Length, diameter, and pitch of screw were 2, 0.78, and 0.5 m, respectively. The experimental design was a randomized complete block (RCB) with factorial layout. Maximum and minimum power requirements of tested screw conveyor were 99.29 and 81.16 Watt corresponding to conveying capacity of 3.210 and 1.975 ton/hour obtained for khazar and Alikazemi varieties, respectively. The results indicated that as screw inclination angle increased from 0 to 80°, the conveying capacity decreased significantly from 3.581 to 0.932 t/h. It can be concluded that the most conveying capacity was 4.955 t/h at tests with khazar variety and conveyor inclination angle zero degree.

  6. Optimation of a Table Conveyor Type Grading Machine to Increase the Performance of Green Coffee Manual Sortation

    Directory of Open Access Journals (Sweden)

    Sukrisno Widyotomo

    2006-05-01

    Full Text Available Coffee consumers request a good quality of green coffee to get a good coffee cup taste. Defective beans e.g. black bean, brown bean and broken bean are associated to low coffee quality which give negative effects to final taste. To meet the standard export requirement, coffee beans have to be graded before being traded. Until now, grading process is generally carried out manually. The method gives better product, so the grading cost is very expensive about 40% of total processing cost. Meanwhile, shortage of skill workers is a limiting factor of the process. Therefore, improving the manual sorting by providing machine for grading of green coffee is good alternative to reduce the grading cost. Indonesian Coffee and Cocoa Research Institute has designed a table conveyor type grading machine in order to improve the performance of the manual grading productivity and consistent quality and to reduce the grading cost. The conveyor belt has a dimension of 5700 mm of length, 610 mm of width and 6 mm of thickness. The rotating of belt conveyor powered by an electro motor 3 HP, 3 phase and 1420 rpm. The result showed that the optimum capacity of grading machine was 390 kg/hour reached when the speed 16 rpm and 3 kg/m 2 of green beans on belt conveyor with productivity 1870 kg/man-day compared to the productivity full manually process 743 kg/man-day. Percentage of product in outlet 1 was 4.2% as broken beans, 0.26% as brown beans, 0.68% as one hole in beans and 0.61% as more than one hole in beans. Percentage of product in outlet 2 was 39.54% as broken beans, 4.23% as brown beans 7.19% as black beans, 4.47% as one hole in beans and 4.43% as more than one hole in beans. Cost of grading process per kg of green coffee is Rp20,-. Key words : Coffee, Grading, Conveyor table, Quality

  7. Hydraulic engines in armoured conveyors; Motores hidraulicos en los transportadores blindados

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Fernandez, N.; Fernandez Equibar, J.L. [Hullera Vasco-Leones, S.A., Leon (Spain)

    1994-05-01

    The Sociedad Anonima Hullera Vasco-Leonesa (HVL) coal mining company in Spain is exploiting a deposit of large subvertical seams which are characterised by being highly tectonised. A very important part of the work of exploitation is developed in the depths of the mine with the aid of secondary ventilation. In the near future, which will characterise itself with the opening of the `New Mine`, this type of work will come to have a significant relevance in underground mining technology. The limitations of space and the presence of methane necessitate, as for many years, the use of pneumatic moving shields, with the great inconveniences which derive from them: reduced energy efficiency, and elevated production of dust and noise. For this HVL seek to introduce in a conventional working, at the bottom of the mine, a system of armoured conveyors driven by hydraulic units, which besides reducing and/or eliminating the problems referred to above serve, as in the past, to extend hydraulic energy into other parts of mining activity. In order to initiate the proposed investigation a pilot project will be partially financed by Ocicarbon. 5 figs.

  8. Low-Voltage Ultra-Low-Power Current Conveyor Based on Quasi-Floating Gate Transistors

    Directory of Open Access Journals (Sweden)

    F. Khateb

    2012-06-01

    Full Text Available The field of low-voltage low-power CMOS technology has grown rapidly in recent years; it is an essential prerequisite particularly for portable electronic equipment and implantable medical devices due to its influence on battery lifetime. Recently, significant improvements in implementing circuits working in the low-voltage low-power area have been achieved, but circuit designers face severe challenges when trying to improve or even maintain the circuit performance with reduced supply voltage. In this paper, a low-voltage ultra-low-power current conveyor second generation CCII based on quasi-floating gate transistors is presented. The proposed circuit operates at a very low supply voltage of only ±0.4 V with rail-to-rail voltage swing capability and a total quiescent power consumption of mere 9.5 µW. Further, the proposed circuit is not only able to process the AC signal as it's usual at quasi-floating gate transistors but also the DC which extends the applicability of the proposed circuit. In conclusion, an application example of the current-mode quadrature oscillator is presented. PSpice simulation results using the 0.18 µm TSMC CMOS technology are included to confirm the attractive properties of the proposed circuit.

  9. The conveyor belt hypothesis for thymocyte migration: participation of adhesion and de-adhesion molecules

    Directory of Open Access Journals (Sweden)

    Villa-Verde D.M.S.

    1999-01-01

    Full Text Available Thymocyte differentiation is the process by which bone marrow-derived precursors enter the thymus, proliferate, rearrange the genes and express the corresponding T cell receptors, and undergo positive and/or negative selection, ultimately yielding mature T cells that will represent the so-called T cell repertoire. This process occurs in the context of cell migration, whose cellular and molecular basis is still poorly understood. Kinetic studies favor the idea that these cells leave the organ in an ordered pattern, as if they were moving on a conveyor belt. We have recently proposed that extracellular matrix glycoproteins, such as fibronectin, laminin and type IV collagen, among others, produced by non-lymphoid cells both in the cortex and in the medulla, would constitute a macromolecular arrangement allowing differentiating thymocytes to migrate. Here we discuss the participation of both molecules with adhesive and de-adhesive properties in the intrathymic T cell migration. Functional experiments demonstrated that galectin-3, a soluble ß-galactoside-binding lectin secreted by thymic microenvironmental cells, is a likely candidate for de-adhesion proteins by decreasing thymocyte interaction with the thymic microenvironment.

  10. Long distance kelp rafting impacts seaweed biogeography in the Northeast Pacific: the kelp conveyor hypothesis.

    Science.gov (United States)

    Saunders, Gary W

    2014-12-01

    Routine DNA barcoding of the Haida Gwaii seaweed flora revealed "endemic species" attributed initially to this region's past as a glacial refugium. However, subsequent barcode records from central California rapidly eroded this list leaving species characterized by disjunct distributions (DD) between California and Haida Gwaii. This observation prompted a more detailed look at species for California and British Columbia and revealed that 33 of 180 DNA-barcoded genetic groups in common between these regions (~18%) predominantly displayed DD between California and northern British Columbia. A previous discovery that a red abalone shell found in Haida Gwaii (far north of its range) had a float-bearing kelp (Nereocystis luetkeana) holdfast attached to it prompted a closer consideration of the COI-5P barcode data in support of a "kelp conveyor hypothesis." The hypothesis posits that there has been a net migration of Californian species to northern British Columbia the vector being species growing on substrata carried along with kelp rafts on the winter Davidson Current.

  11. 砷料送料机的螺旋输送机的设计%Design of Screw Conveyor in Arsenic Materials Feeder

    Institute of Scientific and Technical Information of China (English)

    刘涛; 陈秋月; 朱磊; 刘铁

    2014-01-01

    To meet the accurate feeding requirement of arsenic material feeder ,a screw conveyor is designed .The structure design and calculation of the screw conveyor under this working condition is introduced ,the transmission system of the device is described in detail .This screw conveyor can garantee the arsenic material's accurate feeding and improves the efficiency of equipment .%为满足砷料送料机工作的要求,采用螺旋输送机构进行精确送料,对此工况下所要求的螺旋输送机结构进行设计与计算,对其驱动装置做了深入设计,保证了砷料的精确送料,提高了设备的生产效率。

  12. An Integrated MCDM Model for Conveyor Equipment Evaluation and Selection in an FMC Based on a Fuzzy AHP and Fuzzy ARAS in the Presence of Vagueness.

    Science.gov (United States)

    Nguyen, Huu-Tho; Dawal, Siti Zawiah Md; Nukman, Yusoff; Rifai, Achmad P; Aoyama, Hideki

    2016-01-01

    The conveyor system plays a vital role in improving the performance of flexible manufacturing cells (FMCs). The conveyor selection problem involves the evaluation of a set of potential alternatives based on qualitative and quantitative criteria. This paper presents an integrated multi-criteria decision making (MCDM) model of a fuzzy AHP (analytic hierarchy process) and fuzzy ARAS (additive ratio assessment) for conveyor evaluation and selection. In this model, linguistic terms represented as triangular fuzzy numbers are used to quantify experts' uncertain assessments of alternatives with respect to the criteria. The fuzzy set is then integrated into the AHP to determine the weights of the criteria. Finally, a fuzzy ARAS is used to calculate the weights of the alternatives. To demonstrate the effectiveness of the proposed model, a case study is performed of a practical example, and the results obtained demonstrate practical potential for the implementation of FMCs.

  13. Comparative study of Hippo pathway genes in cellular conveyor belts of a ctenophore and a cnidarian

    Directory of Open Access Journals (Sweden)

    Alicia Coste

    2016-02-01

    Full Text Available Abstract Background The Hippo pathway regulates growth rate and organ size in fly and mouse, notably through control of cell proliferation. Molecular interactions at the heart of this pathway are known to have originated in the unicellular ancestry of metazoans. They notably involve a cascade of phosphorylations triggered by the kinase Hippo, with subsequent nuclear to cytoplasmic shift of Yorkie localisation, preventing its binding to the transcription factor Scalloped, thereby silencing proliferation genes. There are few comparative expression data of Hippo pathway genes in non-model animal species and notably none in non-bilaterian phyla. Results All core Hippo pathway genes could be retrieved from the ctenophore Pleurobrachia pileus and the hydrozoan cnidarian Clytia hemisphaerica, with the important exception of Yorkie in ctenophore. Expression study of the Hippo, Salvador and Scalloped genes in tentacle “cellular conveyor belts” of these two organisms revealed striking differences. In P. pileus, their transcripts were detected in areas where undifferentiated progenitors intensely proliferate and where expression of cyclins B and D was also seen. In C. hemisphaerica, these three genes and Yorkie are expressed not only in the proliferating but also in the differentiation zone of the tentacle bulb and in mature tentacle cells. However, using an antibody designed against the C. hemiphaerica Yorkie protein, we show in two distinct cell lineages of the medusa that Yorkie localisation is predominantly nuclear in areas of active cell proliferation and mainly cytoplasmic elsewhere. Conclusions This is the first evidence of nucleocytoplasmic Yorkie shift in association with the arrest of cell proliferation in a cnidarian, strongly evoking the cell division-promoting role of this protein and its inhibition by the activated Hippo pathway in bilaterian models. Our results furthermore highlight important differences in terms of deployment and

  14. Performance of a convective, infrared and combined infrared- convective heated conveyor-belt dryer.

    Science.gov (United States)

    El-Mesery, Hany S; Mwithiga, Gikuru

    2015-05-01

    A conveyor-belt dryer was developed using a combined infrared and hot air heating system that can be used in the drying of fruits and vegetables. The drying system having two chambers was fitted with infrared radiation heaters and through-flow hot air was provided from a convective heating system. The system was designed to operate under either infrared radiation and cold air (IR-CA) settings of 2000 W/m(2) with forced ambient air at 30 °C and air flow of 0.6 m/s or combined infrared and hot air convection (IR-HA) dryer setting with infrared intensity set at 2000 W/m(2) and hot at 60 °C being blown through the dryer at a velocity of 0.6 m/s or hot air convection (HA) at an air temperature of 60 °C and air flow velocity 0.6 m/s but without infrared heating. Apple slices dried under the different dryer settings were evaluated for quality and energy requirements. It was found that drying of apple (Golden Delicious) slices took place in the falling rate drying period and no constant rate period of drying was observed under any of the test conditions. The IR-HA setting was 57.5 and 39.1 % faster than IR-CA and HA setting, respectively. Specific energy consumption was lower and thermal efficiency was higher for the IR-HA setting when compared to both IR-CA and HA settings. The rehydration ratio, shrinkage and colour properties of apples dried under IR-HA conditions were better than for either IR-CA or HA.

  15. The interaction between warm conveyor belts and breaking Rossby waves: a climatological perspective.

    Science.gov (United States)

    Madonna, Erica; Joos, Hanna; Martius, Olivia; Aebi, Christine; Limbach, Sebastian

    2014-05-01

    Warm conveyor belts (WCBs) are moist ascending airstreams in extratropical cyclones. Climatologically, they are key for the meridional and vertical transport of water vapour and heat. The rapid ascent of WCBs from the boundary layer to the upper troposphere in about 1-2 days leads to cloud formation, (intense) precipitation and the release of latent heat, which modifies their potential vorticity (PV) value in a significant way. Typically WCBs reach the tropopause level with low PV values (~0.5 pvu) and therefore the cross-isentropic transport of low-PV air in WCBs can amplify upper-level Rossby waves and contribute to the formation of PV streamers downstream. Here, filamentary PV streamers are regarded as clear signs of breaking Rossby waves. They in turn can act as precursors of extreme weather events and/or trigger the genesis of another cyclone, potentially generating a new WCB. The aim of this study is to quantify the interaction of WCBs and PV-streamers from a climatological point of view for the ERA-Interim data set for the period 1989-2010. WCBs are identified from comprehensive trajectory calculations that select air parcels in the vicinity of cyclones with a minimum ascent of 600 hPa in 48 hours. From these WCB trajectories, coherent features of WCB outflows are derived and checked for overlapping with PV streamers, which are identified using a contour searching algorithm. Both, WCBs and PV-streamers are then tracked using a novel feature tracking technique, which is based upon a modified region growing approach. With this technique, the interaction of WCBs and PV-streamers is analysed for a 22-years period leading to novel insight about the role of WCBs for triggering the breaking of Rossby waves, as well as, vice versa, about the importance of PV-streamers for the formation of new WCBs.

  16. 带式输送机托辊的参数化设计%Parametric design on belt conveyor roller

    Institute of Scientific and Technical Information of China (English)

    冷岳峰

    2013-01-01

    To solve parametric drawing problem of belt conveyor roller design,uses inlays language VBA principle and method to achieves the parametric design process of the belt conveyor roller components. uses inlays language VBA to writing drawing program,using this application,designers can input the corresponding parameters to get the result of roller drawing to get belt conveyor roller drawings and assembly drawings and other drawing results.The parametric design method reducts design cycle to some kinds of components, reduce the designer’s drawing labour intensity ,and enhances the drawing quality and efficiency.%  为解决带式输送机托辊设计中的参数化绘图问题,采用 VBA 对带式输送机托辊进行参数化设计的原理和方法,实现在 AutoCAD2004环境下,利用 AutoCAD 自带的二次开发软件包 VBA 编制绘图程序,利用此应用程序,设计人员只需输入几个相应的设计参数就可得到托辊完整的零件图和装配图等绘图结果。这种参数化设计方法不仅缩短了对某类零件的设计周期,减轻设计人员绘图劳动强度,同时还提高设计的质量和效率。

  17. Study on the reliability of the underground conveyor belt system installed at Vulcan Mine, the Jiu Valley Basin in Romania

    Directory of Open Access Journals (Sweden)

    Tomuș Ovidiu-Bogdan

    2017-01-01

    Full Text Available The paper deals with a comprehensive reliability analysis of the conveyor belts belonging to an underground coal mine in the Jiu Valley, Romania. As resulted from the mine management reports, the transportation system is responsible for many downtimes and is a real bottleneck in the constant and adequate production, and the suspicion is the weak state of belt conveyers, which are the spinal column of the extraction process. For this reason, a comprehensive reliability analysis has been decided, in order to deliver a maintenance-upgrading plan.

  18. 基于输送机链轮的数控铣削加工编程研究%Research on CNC Milling Programming for Conveyor Chain

    Institute of Scientific and Technical Information of China (English)

    李传军

    2012-01-01

    利用配有HNC-22M的XKN715数控铣床,基于宏程序和子程序开发输送机链轮齿形数控加工程序,并给出典型链轮齿形加工数控程序实例.%Using XKN715 CNC milling machine equipped with HNC 22M system, the NC program for conveyor chain was developed based on macro program and subroutines. And a NC programming example for typical conveyor chain tooth profile was given.

  19. DELTA机器人传送带与视觉的综合标定方法%Method of Integrated Calibration on DELTA Robot Conveyor and Vision

    Institute of Scientific and Technical Information of China (English)

    杨强; 刘冠峰

    2015-01-01

    In this paper we propose an method of integrated calibration on DELTA robot conveyor and vision. We first use the end of DELTA robot arm to touch the same point on the conveyor when the conveyor moves some distance,which allows us to obtain the value of the point’s location in the robot coordinate system and the corresponding value of the encoder.,then we get the scale factor of the robot and conveyor,determine the transformation matrix between the robot coordinate system and the conveyor coordinate system, then we can know the pose of the conveyor coordinate system relative to the coordinate system of the robot,which is the conveyor calibration. By using the camera to posit in contact with the robot at the same point, we obtain the intrinsic matrix and the external parameters matrix of the camera, which can know the transformation matrix between the robot coordinate system and the camera coordinate system, which is the robot vision calibration. DELTA robot conveyor and vision calibration will make the foundation of achieving DELTA robot high-precision control.%提出一种关于DELTA机器人传送带与视觉的综合标定方法。通过DELTA机器人臂末端在传送带移动一段距离接触传送带始末同一点,得到该点在机器人坐标系的位置和编码器上对应的读数,得到传送带与机器人的比例因子,确定机器人坐标系与传送带坐标系的转化矩阵,从而得到传动带相对于机器人坐标系的位姿,即传送带的标定。通过相机定位与机器人接触同一点,从而确定相机的内参矩阵与外参矩阵,从而得到机器人与相机坐标系的转换关系,即机器人视觉的标定。DELTA机器人传送带与视觉的标定,为DELTA机器人高精度控制的实现打下基础。

  20. Conveyor Performance based on Motor DC 12 Volt Eg-530ad-2f using K-Means Clustering

    Science.gov (United States)

    Arifin, Zaenal; Artini, Sri DP; Much Ibnu Subroto, Imam

    2017-04-01

    To produce goods in industry, a controlled tool to improve production is required. Separation process has become a part of production process. Separation process is carried out based on certain criteria to get optimum result. By knowing the characteristics performance of a controlled tools in separation process the optimum results is also possible to be obtained. Clustering analysis is popular method for clustering data into smaller segments. Clustering analysis is useful to divide a group of object into a k-group in which the member value of the group is homogeny or similar. Similarity in the group is set based on certain criteria. The work in this paper based on K-Means method to conduct clustering of loading in the performance of a conveyor driven by a dc motor 12 volt eg-530-2f. This technique gives a complete clustering data for a prototype of conveyor driven by dc motor to separate goods in term of height. The parameters involved are voltage, current, time of travelling. These parameters give two clusters namely optimal cluster with center of cluster 10.50 volt, 0.3 Ampere, 10.58 second, and unoptimal cluster with center of cluster 10.88 volt, 0.28 Ampere and 40.43 second.

  1. Noise Reduction of Steel Cord Conveyor Belt Defect Electromagnetic Signal by Combined Use of Improved Wavelet and EMD

    Directory of Open Access Journals (Sweden)

    Hong-Wei Ma

    2016-09-01

    Full Text Available In order to reduce the noise of a defect electromagnetic signal of the steel cord conveyor belt used in coal mines, a new signal noise reduction method by combined use of the improved threshold wavelet and Empirical Mode Decomposition (EMD is proposed. Firstly, the denoising method based on the improved threshold wavelet is applied to reduce the noise of a defect electromagnetic signal obtained by an electromagnetic testing system. Then, the EMD is used to decompose the denoised signal and then the effective Intrinsic Mode Function (IMF is extracted by the dominant eigenvalue strategy. Finally, the signal reconstruction is carried out by utilizing the obtained IMF. In order to verify the proposed noise reduction method, the experiments are carried out in two cases including the defective joint and steel wire rope break. The experimental results show that the proposed method in this paper obtains the higher Signal to Noise Ratio (SNR for the defect electromagnetic signal noise reduction of steel cord conveyor belts.

  2. Overall Performance Evaluation of Tubular Scraper Conveyors Using a TOPSIS-Based Multiattribute Decision-Making Method

    Directory of Open Access Journals (Sweden)

    Yanping Yao

    2014-01-01

    Full Text Available Properly evaluating the overall performance of tubular scraper conveyors (TSCs can increase their overall efficiency and reduce economic investments, but such methods have rarely been studied. This study evaluated the overall performance of TSCs based on the technique for order of preference by similarity to ideal solution (TOPSIS. Three conveyors of the same type produced in the same factory were investigated. Their scraper space, material filling coefficient, and vibration coefficient of the traction components were evaluated. A mathematical model of the multiattribute decision matrix was constructed; a weighted judgment matrix was obtained using the DELPHI method. The linguistic positive-ideal solution (LPIS, the linguistic negative-ideal solution (LNIS, and the distance from each solution to the LPIS and the LNIS, that is, the approximation degrees, were calculated. The optimal solution was determined by ordering the approximation degrees for each solution. The TOPSIS-based results were compared with the measurement results provided by the manufacturer. The ordering result based on the three evaluated parameters was highly consistent with the result provided by the manufacturer. The TOPSIS-based method serves as a suitable evaluation tool for the overall performance of TSCs. It facilitates the optimal deployment of TSCs for industrial purposes.

  3. Persistence of Salmonella on egg conveyor belts is dependent on the belt type but not on the rdar morphotype.

    Science.gov (United States)

    Stocki, S L; Annett, C B; Sibley, C D; McLaws, M; Checkley, S L; Singh, N; Surette, M G; White, A P

    2007-11-01

    Commercial caged layer flocks in Alberta, Canada, are commonly monitored for Salmonella enterica serovar Enteritidis (SE) and S. enterica serovar Typhimurium (ST) by environmental sampling. In one recent case, a SE strain isolated from the egg conveyor belt was a source of persistent infection for the flock. This study was undertaken to examine Salmonella colonization on egg conveyor belts and to determine whether the rdar morphotype, a conserved physiology associated with aggregation and long-term survival, contributed to persistence. Four woven belts constructed of natural or nonnatural fibers and a 1-piece belt made of vinyl were tested with rdar-positive ST and SE strains and a rdar-negative ST DeltaagfD reference strain. The type of egg belt was the most important factor influencing Salmonella colonization and persistence. The vinyl belt, with the least surface area available for colonization, had the fewest Salmonella remaining after washing and disinfection, whereas the hemp-plastic belt, with the greatest surface area, had the most Salmonella remaining. Real-time gene expression indicated that the rdar morphotype was involved in colonizing the egg belt pieces; however, it was not essential for persistence. In addition, rdar-positive and rdar-negative strains were equally similarly to disinfection on the egg belt pieces. The results indicate that Salmonella can persist on a variety of egg belts by mechanisms other than the rdar morphotype, and that using egg conveyer belts with reduced surface area for bacterial colonization can lessen contamination problems.

  4. Comparison of Several Conveyor Soft-Starters%几种输送机软起动装置的比较

    Institute of Scientific and Technical Information of China (English)

    宋恩泽

    2012-01-01

    指出矿用刮板输送机及胶带输送机存在的突出问题是难起动、机头机尾负载不均衡及过载保护装置不可靠。介绍离心离合器、可控液黏离合器及可控行星差速减速器的工作原理、结构和性能特点,及各自的适用范围。%Points out the troublesome problems of scraper and belt conveyors are difficuh start, unbalanced distribution of load over electro-motors on the head and tail of conveyor, and poor reliability of overload protection device. Introduces the working principle, structure, performance and application scope of several soft-starters, such as centrifugal clutch, controlled fluid sticky clutch and controlled planetary differential-speed gear, and makes a comparison among them.

  5. Social anxiety disorder: radio electric asymmetric conveyor brain stimulation versus sertraline

    Directory of Open Access Journals (Sweden)

    Fontani V

    2011-11-01

    Full Text Available Vania Fontani1, Piero Mannu1,2, Alessandro Castagna1, Salvatore Rinaldi11Department of Neuro Psycho Physio Pathology, Rinaldi Fontani Institute, Florence; 2Psychic Studies Center, Cagliari, ItalyPurpose: Social anxiety disorder (SAD is a disabling condition that affects almost 5% of the general population. Many types of drugs have shown their efficacy in the treatment of SAD. There are also some data regarding psychotherapies, but no data are available today about the efficacy of brain stimulation techniques. The aim of the study is to compare the efficacy of noninvasive brain stimulation neuro psycho physical optimization (NPPO protocol performed by radio electric asymmetric conveyor (REAC with that of sertraline in adults with SAD.Patients and methods: Twenty SAD patients on sertraline were compared with 23 SAD patients who refused any drug treatment and who chose to be treated with NPPO-REAC brain stimulation. This was a 6-month, open-label, naturalistic study. Patients on sertraline received flexible doses, whereas NPPO-REAC patients received two 18-session cycles of treatment. Clinical Global Improvement scale items "much improved" or "very much improved" and Liebowitz Social Anxiety Scale total score variation on fear and avoidance components were used to detect the results. The statistical analysis was performed with t-test. All measures <0.05 have been considered statistically significant.Results: Ten of 23 subjects on NPPO-REAC and six of the 20 taking sertraline were much improved or very much improved 1 month after the first NPPO-REAC cycle (t1. Sixteen of the subjects on NPPO-REAC and ten of the subjects taking sertraline were much improved or very much improved 1 month after the second NPPO-REAC cycle (t2. In respect of the Liebowitz Social Anxiety Scale, at t1 NPPO-REAC resulted in statistically more efficacy for sertraline on both fear and avoidance total scores. At t2, NPPO-REAC resulted in statistically more efficacy for

  6. Technical transformation of screw conveyors for PVC drying system%PVC 干燥系统螺旋输送器的技术改造

    Institute of Scientific and Technical Information of China (English)

    陈六娟; 张军锋

    2013-01-01

    介绍了PVC旋流干燥工艺中螺旋输送器存在的问题以及改造措施。%Problems existed in the crew conveyors for the cyclone drying process of PVC were in-troduced as well as technical transform measures.

  7. Characteristic analysis on screw conveyor used for lignite molding%褐煤成型用螺旋输送机的特性分析

    Institute of Scientific and Technical Information of China (English)

    郝兵; 崔郎郎; 李聪杰; 白爱民; 蒋惠民; 刘正魁; 高洁

    2013-01-01

    根据褐煤成型机用螺旋输送机的工作特点,通过对螺旋轴结构进行分析及试验研究,确定一种合理的螺旋结构.通过试验数据得出螺旋输送机输送能力受煤粉的水分、温度和粒度的影响.物料水分增加,会增加螺旋输送机的功耗;物料水分下降,既能降低螺旋输送机功耗,又能提升成型机的成型压力.因此,合理设计螺旋输送机的结构,可为成型机运行参数的确定提供参考.%Based on the operating features of the screw conveyor used for lignite molding machine,after the structure of the screw shaft was analyzed and tested,a screw with reasonable structure was determined.Test data showed the influences of moisture,temperature and granularity of pulverized coal on the transportation capacity of the screw conveyor.The moisture raise led to increase in power consumption of the screw conveyor; the moisture reduction led to decrease in power consumption of the screw conveyor and increase in molding pressure of the molding machine.The screw conveyor with reasonable structure could offer foundation for determining the operating parameters of the molding machine.

  8. Calculation and Selection of Driving Power Belt Conveyor in Mineral Processing Plant%选矿厂带式输送机驱动功率的计算及选取

    Institute of Scientific and Technical Information of China (English)

    杨高天

    2014-01-01

    依选矿厂带式输送机特点,简化带式输送机驱动功率计算公式,并依据选矿工艺,选取带式输送机驱动电机功率。%according to the characteristics of the belt conveyor of mineral processing plant , simplified formula of belt con-veyor driving power , and on the basis of ore dressing process , selection of belt conveyor drive motor power .

  9. Of Rock Damage and the Regolith Conveyor Belt: A Geomorphologist's View of the Critical Zone

    Science.gov (United States)

    Anderson, R. S.; Anderson, S. P.; Tucker, G. E.

    2011-12-01

    Models of hillslope evolution require rules for the rate of detachment of rock into the mobile regolith layer, for the rate of mobile regolith transport, and for channel incision or aggradation rates that serve as boundary conditions. The evolution of material as it passes through the weathered zone is typically ignored, making it difficult to cast proper rules for production of mobile regolith. The current rules are therefore insufficient to address critical zone evolution, in which the chemical, mechanical, and hydrologic properties of the rock and the regolith matter. These properties evolve as rock is weathered during exhumation, and they continue to evolve as particles ride the conveyor belt of mobile regolith downslope. Models that honor specific processes involved in the evolution of rock as it passes through the CZ will both advance models of landscape evolution, and provide context for ecological and hydrological investigations. Physical processes responsible for progressive damage of rock during exhumation in the current CZOs include frost cracking and tree root cracking. If we define damage as the density of flaws within the rock, we require rules governing the rate of generation of new flaws, which will vary with climate, depth, and the present state of damage. We envision a "damage-limited system" in which the likelihood of release of rock fragments into mobile regolith depends on the accumulated damage in the subjacent rock. In most temperate and alpine settings relevant to the present CZOs, the ratio of a rock's residence time in the damage zone to the duration of a climate oscillation is such that a rock parcel will experience the full spectrum of Quaternary climates. This requires that we address both climate history and the damage and transport rates associated with all Quaternary climates. We present numerical models for rock damage, mobile regolith production, and hillslope profile evolution. These models are motivated by the Boulder Creek CZO

  10. Voltage-Mode All-Pass Filters Using Universal Voltage Conveyor and MOSFET-Based Electronic Resistors

    Directory of Open Access Journals (Sweden)

    N. Herencsar

    2011-04-01

    Full Text Available The paper presents two novel realizations of voltage-mode first-order all-pass filters. Both circuits use single universal voltage conveyor (UVC, single capacitor, and two grounded resistors. Using the two NMOS transistors-based realizations of the electronic resistor with two symmetrical power supplies, presented all-pass filter circuits can be easily made electronically tunable. Proposed filter structures provide both inverting and non-inverting outputs at the same configuration simultaneously and they have high-input and low-output impedances that are desired for easy cascading in voltage-mode operations. The nonidealities of the proposed circuits are also analyzed and compared. The theoretical results of both circuits are verified by SPICE simulations using TSMC 0.35 μm CMOS process parameters. Based on the evaluation, the behavior of one of the circuits featuring better performance was also experimentally measured using the UVC-N1C 0520 integrated circuit.

  11. Role of the Bering Strait on the hysteresis of the ocean conveyor belt circulation and glacial climate stability.

    Science.gov (United States)

    Hu, Aixue; Meehl, Gerald A; Han, Weiqing; Timmermann, Axel; Otto-Bliesner, Bette; Liu, Zhengyu; Washington, Warren M; Large, William; Abe-Ouchi, Ayako; Kimoto, Masahide; Lambeck, Kurt; Wu, Bingyi

    2012-04-24

    Abrupt climate transitions, known as Dansgaard-Oeschger and Heinrich events, occurred frequently during the last glacial period, specifically from 80-11 thousand years before present, but were nearly absent during interglacial periods and the early stages of glacial periods, when major ice-sheets were still forming. Here we show, with a fully coupled state-of-the-art climate model, that closing the Bering Strait and preventing its throughflow between the Pacific and Arctic Oceans during the glacial period can lead to the emergence of stronger hysteresis behavior of the ocean conveyor belt circulation to create conditions that are conducive to triggering abrupt climate transitions. Hence, it is argued that even for greenhouse warming, abrupt climate transitions similar to those in the last glacial time are unlikely to occur as the Bering Strait remains open.

  12. A mathematical model and simulation of the drying process of thin layers of potatoes in a conveyor-belt dryer

    Directory of Open Access Journals (Sweden)

    Salemović Duško R.

    2015-01-01

    Full Text Available This paper presents a mathematical model and numerical analysis of the convective drying process of small particles of potatoes slowly moving through the flow of a drying agent - hot moist air. The drying process was analyzed in the form of a one-dimensional thin layer. The mathematical model of the drying process is a system of two ordinary nonlinear differential equations with constant coefficients and an equation with a transcendent character. The appropriate boundary conditions of the mathematical model were given. The presented model is suitable in the automated control. The presented system of differential equations was solved numerically. The analysis presented here and the obtained results could be useful in predicting the drying kinetics of potatoes and similar natural products in a conveyor-belt dryer. [Projekat Ministarstva nauke Republike, br. TR-33049, br. TR-37002 i br. TR-37008

  13. Perancangan Prototype Early Warning System pada Kontrol On/Off Belt Conveyor Menggunakan PLC Siemens S7-300

    Directory of Open Access Journals (Sweden)

    Taufik Taufik

    2016-04-01

    Full Text Available Nowadays, automation system become an important aspect of the manufacturing process because could make integration manufacturing process on it more effective and more efficient. PLC or Programmable Logic Controller is one kind of automation system. Many industries use PLC as automation control device in the manufacturing process to control all kind of process. For example at transportation process of coals in generator industry. Coals could be burned because main elements of coals are carbon, hydrogen, and oxygen. Base on this prototype early warning system design, we get the result if sensor thermocouple detects temperature larger than setpoint temperature (it is 2000C, then PLC will give an order to shut down the output, that is a belt conveyor. The result of this prototype design could use at coals transportation as an early warning system. The design of prototype early warning system could detect and prevent fire because of the consequence of burned coals until spreading of fire could be avoided.

  14. Design of Adaptive Control System of Belt Conveyor of Coal Mine Underground%井下胶带输送机自适应控制系统的设计

    Institute of Scientific and Technical Information of China (English)

    王瑾

    2011-01-01

    In view of problem of idle motion of belt conveyor existed in belt conveyor system of Wangzhuang Coal Mine, a design scheme of adaptive control system of belt conveyor of coal mine underground was proposed. Load current signals of four driving motors of present stage and pre-stage belt conveyors are collected by PLC and load of belt conveyor was forecasted dynamically after the signals are processed by control software, then control frequency signal is output according to the load, which controls frequency converter to drive belt conveyor with corresponding frequency, so as to make belt conveyor run with the best speed. The test result showed that the system can reduce no-load loss of belt conveyor obviously and save electric energy.%针对王庄煤矿胶带输送机系统存在胶带输送机无煤空转的问题,提出了一种井下胶带输送机自适应控制系统的设计方案.该系统由PLC采集本级和前级胶带输送机4台驱动电动机的负载电流信号,经控制软件处理,动态预测出胶带输送机的负荷大小,然后根据负荷大小输出控制频率信号,控制变频器以相应的频率驱动胶带输送机,使胶带输送机以最佳速度运行.试验结果表明,该系统明显减少了胶带输送机的空载损耗,节省了电能.

  15. Study and modeling of changes in volumetric efficiency of helix conveyors at different rotational speeds and inclination angels by ANFIS and statistical methods

    Directory of Open Access Journals (Sweden)

    A Zareei

    2017-05-01

    Full Text Available Introduction Spiral conveyors effectively carry solid masses as free or partly free flow of materials. They create good throughput and they are the perfect solution to solve the problems of transport, due to their simple structure, high efficiency and low maintenance costs. This study aims to investigate the performance characteristics of conveyors as function of auger diameter, rotational speed and handling inclination angle. The performance characteristic was investigated according to volumetric efficiency. In another words, the purpose of this study was obtaining a suitable model for volumetric efficiency changes of steep auger to transfer agricultural products. Three different diameters of auger, five levels of rotational speed and three slope angles were used to investigate the effects of changes in these parameters on volumetric efficiency of auger. The used method is novel in this area and the results show that performance by ANFIS models is much better than common statistical models. Materials and Methods The experiments were conducted in Department of Mechanical Engineering of Agricultural Machinery in Urmia University. In this study, SAYOS cultivar of wheat was used. This cultivar of wheat had hard seeds and the humidity was 12% (based on wet. Before testing, all foreign material was separated from the wheat such as stone, dust, plant residues and green seeds. Bulk density of wheat was 790 kg m-3. The auger shaft of the spiral conveyor was received its rotational force through belt and electric motor and its rotation leading to transfer the product to the output. In this study, three conveyors at diameters of 13, 17.5, and 22.5 cm, five levels of rotational speed at 100, 200, 300, 400, and 500 rpm and three handling angles of 10, 20, and 30º were tested. Adaptive Nero-fuzzy inference system (ANFIS is the combination of fuzzy systems and artificial neural network, so it has both benefits. This system is useful to solve the complex non

  16. SimpleCalculation Method of Belt Conveyor Power%皮带机功率的简易计算方法

    Institute of Scientific and Technical Information of China (English)

    谷俊斐

    2013-01-01

    This article describes the arrangement of the belt conveyor , comes up with a simple method of belt conveyor pow-er by analyzing the drive roller structure .The calculation method is simple , easy to grasp and effective .%本文简要介绍了皮带机的布置形式,通过分析皮带机传动滚筒轴的组成结构,提出了皮带机传动滚筒轴功率的简易计算方法,该计算方法简单明了,易于掌握,为皮带机的设计提供了有效的参考方法。

  17. 大容量物料存储输送中螺旋输送机的控制%Control of Large Capacity Storage Conveying Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    宋向前; 许胜; 沈春龙; 赵振江

    2015-01-01

    针对螺旋输送机在大容量物料输送过程中对超载敏感、易堵塞等问题,设计了大型料罐存储物料、以空气压缩泵及电动料罐阀为辅助动作、由螺旋输送机大容量输送的触摸屏控制系统。%In the process of screw conveyor in the bulk material on overload sensitive, blockage problem, the design of large tank storage material, with air compressor pump and electric tank valve action, assisted by a screw conveyor bulk transport of touch screen control system.

  18. 物料压缩率对长距离绞龙输送的影响%Effect of product compression ratio in the long transfer screw conveyor

    Institute of Scientific and Technical Information of China (English)

    崔斌; 孔震; 徐飞翔; 赵雪峰; 韩俊巍

    2013-01-01

    In this article we present the concepts of product compression ratio, and analyse the effect of product compression ratio in the long transfer screw conveyor, also give the solution for the jam which cause by the compression ratio in the long transfer screw conveyor.%文章提出了物料压缩率的概念,针对物料压缩率的特性对长距离绞龙的影响作出了分析,并且对长距离绞龙由于物料压缩率问题引起的堵料提出了解决方案。

  19. 粮食输送设备密封的重要性及其分类%The important and classification of seal for food conveyors

    Institute of Scientific and Technical Information of China (English)

    赵显荣; 付忠华

    2014-01-01

    It is necessary to ensure good seal performance for food conveyors .this article introduces emphasize several common seal construction,for example,woolens seal、flexible filler seal、high molecule material seal and so on , and the development tendency of seal requirement in the food conveyors.%粮食输送设备具有良好的密封性能是很必要的,本文重点介绍了毛毡密封、软填料密封、高分子材料密封等几种常见的密封结构及粮食输送设备密封要求的发展趋势。

  20. 螺旋输送钢球过程中的粒子夹卡问题%Particle clamping problem during delivery of steel particles by screw conveyor

    Institute of Scientific and Technical Information of China (English)

    崔海博; 赵惠清

    2012-01-01

    在粒子冲击钻井系统中,钢球高压螺旋输送机是关键装置之一.因钢球材质的特性及输送工况与常规螺旋输送机有着很大差异,进而所造成的钢球夹卡现象(严重时导致闷车)是不容忽视的问题.文中通过试验研究,找出了钢球在螺旋输送过程中极易夹卡的位置,分析了各种夹卡现象存在的原因,对螺旋输送机的结构进行了适应性改进.%The screw conveyor delivering steel particles material under high pressure is among key facilities of particle ?injection system used for the particle impact drilling. The steel particles would always be got stuck is a serious problem. Because the nature of steel particles and the working conditions of screw conveyor is different from conventional screw conveyor. This article finds out where it happens, analyzes the reason and finishes the structural improvement by experiment. The paper has researched influence.

  1. 半封闭螺旋输送机运动量及几何参数确定%Semi-enclosed Screw Conveyor Exercise and Geometric Parameters

    Institute of Scientific and Technical Information of China (English)

    李新; 薛风

    2013-01-01

      Based on the closed spiral conveyor within a single material as the research object, this paper carries on the analysis, obtains the granular material parameter design criterion and the formula for calculation and checking, providing the way for selecting and determining semi-enclosed screw conveyor operating parameters and geometric parameters, to be conduce to semi hermetic screw conveyor design and application.%  通过对半封闭螺旋输送机内单颗物料为研究对象进行分析,得出了输送散体物料过程中主要参数设计准则及其计算和校验公式,为半封闭螺旋输送机的工作参数和几何参数的选择和确定提供了方法,有助于半封闭螺旋输送机的设计和应用。

  2. New Conveyor Belt Lubrication Self-cleaning System%新型输送带润滑自清洁系统

    Institute of Scientific and Technical Information of China (English)

    王海兵; 许斌; 刘凤臣; 叶鹏

    2011-01-01

    In various types of beverage production line, conveyor belt plays an essential role. In order to prevent the bottle inverting, reducing wear, conveyor belt need to be lubricated. Lubrication by spraying is commonly used, but it exists kinds of problems such as non-uniform, waste, unfriendly-environment, breeding bacteria, scaling, and plugin noggle easily, difficult to clean and so on. Through comparative analysis, the paper proposed a new conveyor belt lubrication selfcleaning system with several advantages such as cycling lubrication, cleanness and asepsis, friendly environment conservation and maintenance fiee.[Ch,5 fig.1 tab.9 ref.]%在各类饮料生产线中,输送带起着不可或缺的作用.为了防止倒瓶、减少输送带自身的磨损,需对输送带进行润滑.通常采用的传统喷洒式润滑方法,在实际使用中存在润滑不均匀、浪费大、不环保、易长菌、易结垢、难清洁、喷嘴易堵塞等问题.通过对比分析,研制出一种新型的输送带滑润自清洁系统,具有循环润滑、清洁无菌、节约环保、免维护的优点.

  3. Experiment on asphalt mixture segregation in screw conveyor%沥青混合料在螺旋处的离析试验

    Institute of Scientific and Technical Information of China (English)

    谢立扬; 张晨光; 赵利军

    2013-01-01

    In order to exactly find out segregation reasons and segregation distribution regularities of asphalt mixture in screw conveyor during the paving process,based on the kinetic characteristics of mixture,this paper analyzed the relationship between the particles' axial and circumferential velocity and radius,pitch,rotational speed and friction coefficient under the action of screw conveyor.Meanwhile,field tests were conducted to get the segregation distribution regularities of asphalt mixture in screw conveyor.The results indicate that the mixture segregation is mainly affected by the spiral structure and the kinetic parameters.With the increase of radius,the particles' axial velocity monotonically increases,the circumferential velocity increases first and then decreases and the circumferential velocity is approximately equal to the axial velocity in the primary working range (radius 14~21 cm).So the segregation can be restricted by changing the rotational speed of screw conveyor and the relative position of screw conveyor and asphalt mixture.The asphalt content in the upper part of the screw is 2% higher than that in the bottom,the asphalt content in the central part of the screw is 0.7 % higher than that in both sides,the deviation of asphalt mixture gradation is in the specified range,but the asphalt mixture in the upper part of the screw contains more fine aggregate.Using the method of completely burying the crew conveyor,we can solve the asphalt content segregation occurring in the crew suspension.But the segregation between the upper and the lower part of the crew conveyor still exists.2 tabs,9 figs,11 refs.%为准确掌握摊铺过程中沥青混合料在螺旋分科器中的离析原因及分布规律,基于混合料在螺旋内的运动特性,分析了螺旋作用下混合料颗粒的轴向速度及圆周速度与螺旋半径、节距、转速及摩擦因数之间的关系,并通过现场试验给出了混合料离析在螺旋中的分布规律.结果

  4. 螺旋输送机螺旋体优化设计%Optimization Design of Screw in Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    王铁流; 郭晓梅; 陈仙明

    2012-01-01

    The process of finite element analysis and optimization design of screw for screw conveyor with the Pro/Engineer is discussed, the main steps and methods are also introduced. Subject to the requirements of the structural parameters and design objectives, the optimal design is realized efficiently and rapidly. A practical method is improved for the design quality of screw.%应用Pro/Engineer软件,研究了螺旋输送机螺旋体的有限元分析和优化设计方法和过程,介绍了设计过程的主要步骤和方法.在满足结构参数和设计目标要求的前提下,快捷、有效地实现了优化设计,提高了设计质量,为螺旋体的设计提供了一种有效的方法.

  5. Occupational exposure to rubber vulcanization products during repair of rubber conveyor belts in a brown coal mine

    Energy Technology Data Exchange (ETDEWEB)

    Gromiec, J.P.; Wesolowski, W.; Brzeznicki, S.; Wroblewska-Jakubowska, K.; Kucharska, M. [Nofer Institute of Occupational Medicine, Lodz (Poland)

    2002-12-01

    This study was carried out to identify chemical substances and measure their air concentrations in the repair shop of a brown coal mine in which damaged rubber conveyor belts were repaired. GC-MS and HPLC analysis of stationary air samples resulted in identification of aliphatic and aromatic hydrocarbons to C{sub 12}, PAHs, alcohols, phenols, ketones, heterocyclic nitrogen and sulfur compounds. Quantitative evaluation of occupational exposure included determination of organic compound vapours collected on charcoal (GC-MSD), polycyclic aromatic hydrocarbons (HPLC), N-nitrosoamines and other amines (GC-NPD) and DNPH derivatives of aldehydes (HPLC) in the breathing zone of workers representing all job titles. The concentrations of investigated compounds were very low. Carcinogenic substances: N-nitrosoamines, benzene, and PAHs were not present in workroom air in concentrations exceeding limits of detection of the analytical methods being applied; concentrations of methylisobutylketone, tetrachloroethylene, naphtha, aromatic hydrocarbons, phthalates and aldehydes were much lower than the respective occupational exposure limit values. The results indicate much lower exposure than that reported in the production of tyres and other fabricated rubber products.

  6. 一种电动辊道输送车%One Type of Electric Roller Conveyor Truck

    Institute of Scientific and Technical Information of China (English)

    祝洲杰; 吴锂力

    2015-01-01

    Based on the accurate judgment of warehousing market and combined with the actual needs of customers,designed a new type of electric roller conveyor truck. This paper introduces the technical characteristics and performance characteristics of this truck , elaborates the structure. This truck provides a good solution to solve the actual problems in some working conditions.%通过对仓储物流细分市场的准确判断,结合客户的实际需求,研制了全电动辊道输送车。本文介绍了该车型的主要技术特点和性能特点,详细阐述了其结构实现方式和工作原理。该车型为解决某些工况环境下的实际问题提供了良好的解决方案。

  7. Noninvasive radioelectric asymmetric conveyor brain stimulation treatment improves balance in individuals over 65 suffering from neurological diseases: pilot study

    Directory of Open Access Journals (Sweden)

    Margotti ML

    2012-02-01

    Full Text Available Vania Fontani1, Salvatore Rinaldi1, Alessandro Castagna1, Matteo Lotti Margotti21Department of Neuro Psycho Physio Pathology, Rinaldi Fontani Institute, Florence, Italy; 2Department of Information Technology and Statistical Analysis, Rinaldi Fontani Institute, Florence, ItalyPurpose: In the elderly population, problems with walking and balance are very common. These problems seriously affect the quality of life of the elderly. When gait and balance problems are caused by neurological disease, these problems can be more serious and difficult to handle. The aim of this pilot study was to verify the effect of a noninvasive radioelectric conveyor asymmetric brain stimulation protocol, named neuropostural optimization (NPO, to improve balance in neurological elderly.Patients and methods: Twelve patients suffering from various neurological diseases participated in this study. They were assessed with the Romberg test, which was performed on a computerized stabilometric platform before, immediately following, and 72 hours after NPO was used to improve balance.Results: The results showed that a stabilization of balance was recorded in all subjects a few minutes after administration of NPO. This stabilization increased 72 hours after treatment.Conclusion: The results show that NPO could be a valuable therapeutic approach to improve sensory-motor strategies and neurological control of balance in elderly patients suffering from various neurological diseases.Keywords: Romberg test, instability, imbalance, gait, REAC, neuropostural optimization

  8. Conveyor Cultivation of the Halophytic Plant Salicornia europaea for the Recycling of NaCl from Human Liquid Waste in a Biological Life Support System.

    Science.gov (United States)

    Balnokin, Yurii; Myasoedov, Nikolay; Popova, Larissa; Tikhomirov, Alexander A.; Ushakova, Sofya; Tikhomirova, Natalia; Lasseur, Christophe; Gros, Jean-Bernard

    One problem in designing bioregenerative life support systems (BLSS) is developing technolo-gies to include human liquid and solid waste in intrasystem recycling. A specific task is recycling of NaCl excreted in urine by humans. We showed recently that this could be achieved through inclusion of the salt accumulating halophyte Salicornia europaea in the autotrophic compart-ment of the BLSS (Balnokin et al., ASR, 2010, in press). A model of NaCl circulation in BLSS with inclusion of S. europaea was based on the NaCl turnover in the human -urine -nutrient solution -S. europaea -human cycle. Mineralized urine was used as a basis for preparation of a nutrient solution for the halophyte cultivation. The shoots of the halophyte cultivated in the mineralized urine and containing NaCl could to be used by the BLSS inhabitants in their diets. In this report we describe cultivation of S. europaea which allows turnover of NaCl and produces daily shoot biomass containing Na+ and Cl- in quantities approximately equal to those excreted in daily human urine. The plants were grown in water culture in a climatic chamber under controlled conditions. A solution simulating mineralized urine (SSMU) was used as a basis for preparation of a nutri-ent solution for S. europaea cultivation. For continuous biomass production, seedlings of S. europaea, germinated preliminary in moist sand, were being transferred to the nutrient solu-tion at regular intervals (every two days). Duration of the conveyor operation was 112 days. During the first 56 days, the seedlings were being planted in SSMU diluted by a factor of 1.5 (2/3 SSMU). The same solution was introduced into the growth vessels as volumes of growth medium decreased due to plant transpiration. Starting from the 56th day as conveyor operation was initiated, the plants were being harvested every two days; the solutions from the discharged vessels were mixed with the fresh SSMU and the mixture was introduced into all other growth vessels of

  9. Noninvasive brain stimulation by radioelectric asymmetric conveyor in the treatment of agoraphobia: open-label, naturalistic study

    Directory of Open Access Journals (Sweden)

    Mannu P

    2011-11-01

    Full Text Available Piero Mannu, Salvatore Rinaldi, Vania Fontani, Alessandro Castagna, Matteo Lotti MargottiDepartment of Neuro Psycho Physio Pathology, Rinaldi Fontani Institute, Florence, ItalyBackground: Agoraphobia is considered to be the most serious complication of panic disorder. It involves progressive development of debilitating anxiety symptoms related to being in situations where one would be extremely embarrassed and could not be rescued in the case of a panic attack. This study aimed to investigate the efficacy of noninvasive brain stimulation using a radioelectric asymmetric conveyor (REAC for agoraphobia.Patients and methods: Twenty-three patients (3 males and 20 females suffering from agoraphobia and without a history of panic disorder were evaluated by a psychiatrist using the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, and the Agoraphobia Scale (AS. The patients were subjected to two 18-session cycles of noninvasive brain stimulation with the REAC, according to an established therapeutic protocol called neuro-psycho-physical optimization.Results: Analyzing the anxiety and avoidance parameters of the AS after the first and second cycles of REAC treatment revealed variation in levels of response to treatment, including weak (AS item 7, moderate (AS items 10 and 13, and good responses (AS items 1–6, 8, 9, 11, 12, and 14–20.Conclusion: These results highlight the potential of the REAC to treat complex clinical situations such as agoraphobia, which is typically resistant to pharmacologic treatments. Furthermore, these data show the advantages of REAC treatment, even compared with modern cognitive behavioral therapy, including a relatively rapid and “stable” clinical response (just over 6 months and economic cost.Keywords: anxiety, avoidance, fear, REAC

  10. FPGA-Based HD Camera System for the Micropositioning of Biomedical Micro-Objects Using a Contactless Micro-Conveyor

    Directory of Open Access Journals (Sweden)

    Elmar Yusifli

    2017-03-01

    Full Text Available With recent advancements, micro-object contactless conveyers are becoming an essential part of the biomedical sector. They help avoid any infection and damage that can occur due to external contact. In this context, a smart micro-conveyor is devised. It is a Field Programmable Gate Array (FPGA-based system that employs a smart surface for conveyance along with an OmniVision complementary metal-oxide-semiconductor (CMOS HD camera for micro-object position detection and tracking. A specific FPGA-based hardware design and VHSIC (Very High Speed Integrated Circuit Hardware Description Language (VHDL implementation are realized. It is done without employing any Nios processor or System on a Programmable Chip (SOPC builder based Central Processing Unit (CPU core. It keeps the system efficient in terms of resource utilization and power consumption. The micro-object positioning status is captured with an embedded FPGA-based camera driver and it is communicated to the Image Processing, Decision Making and Command (IPDC module. The IPDC is programmed in C++ and can run on a Personal Computer (PC or on any appropriate embedded system. The IPDC decisions are sent back to the FPGA, which pilots the smart surface accordingly. In this way, an automated closed-loop system is employed to convey the micro-object towards a desired location. The devised system architecture and implementation principle is described. Its functionality is also verified. Results have confirmed the proper functionality of the developed system, along with its outperformance compared to other solutions.

  11. PLC在胶带输送机上的应用%The Application of PLC on Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    刘青菊

    2011-01-01

    通过RLC控制系统和PLC可编程控制器的对比,选用可编程序(PLC)控制系统对胶带输送机的电气控制系统进行设计改造,为生产设备集中控制打下基础。本控制系统选用西门子PLC作为控制器,在设计硬件电路中,对PLC及外部低压电器进行选型,设计了硬件接线图并对控制系统提出要求,使之具有控制和保护功能。在软件设计中,给出了程序流程图与梯形图,将硬件和软件有机结合,保证控制系统可靠运行,达到了生产工序要求。%Through the comparison between RLC control system and PLC programmable controller,programmable logic control system(PLC) is used for the electrical control system reform of belt conveyor,to prepare for the centralized control of production equipment.The Siemens PLC control system is used as the controller.In the design of hardware circuit,the selection of proper PLC and external low-voltage electrical appliances is conducted.The hardware wiring diagram is designed and requirement for control system is put forward so that it has control and protection functions.In software design,the program flow chart and ladder diagram is presented,to combine hardware and software to ensure reliable operation of the control system to achieve the production process requirements.

  12. 大型带式输送机驱动能力校核计算%Calculation Method for Drive Capability of Large Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    张建军; 许宁; 赵炎

    2014-01-01

    With the development direction of long distance , large capacity and large angle of belt conveyor , the drive ability is becoming more important.If the drive ability can′t meet the needs of the actual use, the performance of the conveyor belt will greatly discount and cause great waste.A method of calculating the required motor power is introduced, according to the actual installation condition and performance requirements of the belt conveyor .The drive ability is checked whether meet the re-quirements by comparing with the total power of the motors.BH11-1 of Shenhua Huanghua Harbor, for example, the above calculation is verified.%随着带式输送机向长运距、大运载能力、大倾角的方向发展,对其驱动能力的要求也越来越高,如果驱动能力不能满足实际使用需要,输送带的性能将大打折扣,造成很大浪费。从驱动功率角度入手,详细介绍了一种根据带式输送机的实际安装条件和使用性能要求计算驱动电机所需功率的方法。将其与现场安装的电机总功率进行比较,验证驱动能力并以神华黄骅港务公司BH11-1皮带机为例,对上述计算进行了验证。

  13. 中驱软启动可伸缩带式输送机的应用%Application of Flexible Belt Conveyor with Soft Start of Intermediate Driver

    Institute of Scientific and Technical Information of China (English)

    张权

    2015-01-01

    采用中间驱动技术和电控系统对输送机实现自动监控及调节,首先要计算确定中间驱动系统的布置位置和各个驱动点受力分析,得到中间驱动技术可以降低输送带所受张力的结论,提高输送带使用寿命,同时可以降低输送带选型时的强度规格。其次,通过电控技术与调速型液力偶合器的配合,实现带式输送机的软启动控制和多机驱动功率平衡功能等自动化控制。最终得到大功率、大运量、长运距可伸缩带式输送机的设计方法。%Intermediate driving and electronic control system were used to realize the automatic monitoring and control for conveyors. First, we determined the position of the intermediate driving and conducted the force analysis for each driving point. We concluded that the intermediate driving technology could reduce belt tension, extend its service life, and reduce the strength specification. Second, by the matching between the electronic control system and variable speed fluid coupling, the soft start and power balance of multi-motor driving for the belt conveyor could be automatically controlled. Finally, we realized the design for the flexible belt conveyor, featured by high power, large transporting capacity, and long distance.

  14. 煤矿斜井隧道连续皮带机出渣系统选型配置∗%Selection and Configuration for Slag System of Continuous Belt Conveyor in Colliery Inclined Shaft Tunnel

    Institute of Scientific and Technical Information of China (English)

    韩兵

    2016-01-01

    According to the engineering characteristics of deep, long and continuous downhill of the Xinjie colliery inclined shaft, the engineering adaptability and the advantages and disadvantages of the common tunneling mucking methods were contrasted and analyzed, then aiming at the selection of continuous belt conveyor mucking method and the engineering condition, this paper analyzed the driving apparatus placement scheme of single belt conveyor and multi stage belt conveyor. Then based on the optimal scheme of the belt conveyor, the relationship between belt intensity and length of belt conveyor was analyzed, and it established four kinds of working conditions, and the calculation of the parameters of each working condition shows that the arrangement of belt conveyor working conditions is reasonable, all of which can ensure mucking smoothly in the Xinjie colliery inclined shaft engineering.%针对新街煤矿斜井隧道深埋、超长、连续下坡的工程特点,对比分析了常见隧道出渣方式的工程适应性及优缺点,并针对选定的连续皮带机出渣方式和工程条件,对单、多级皮带输送和输送机驱动装置布置方案进行了比较分析,基于优选的皮带机出渣方案,分析了皮带机带强与输送机长度的关系,制定了4种出渣工况,各工况参数计算表明皮带机工况制定合理,能保证新街煤矿斜井工程的顺利出渣。

  15. 盾构螺旋输送机驱动密封故障处理与防护技术%Countermeasures for Malfunctions of Drive Sealing of Screw Conveyors of Shield Machines

    Institute of Scientific and Technical Information of China (English)

    吴朝来

    2012-01-01

    The causes for the malfunctions of the drive sealing of screw conveyors of shield machines, such as irrational screw conveyor design, inclining of screw rod, damage of contacting surface of the screw conveyor case, leaping forward of the screw rod and inadequate grease injection, are analyzed, and countermeasures, including screw conveyor structure optimization, ground conditioning, rationally selecting the screw conveyor speed, avoiding boring with empty chamber and controlling the manufacturing process, are proposed, with the practice in Chongqing as an example. The paper can provide reference for the coping with the malfunctions of the drive sealing of screw conveyors of shield machines in similar projects in the future.%为解决盾构螺旋机驱动密封故障问题,以重庆地区盾构施工情况为依托,结合多台盾构螺旋输送机驱动密封的修复经验,重点分析螺旋输送机驱动密封产生故障的原因:螺旋机设计不合理、螺旋机螺杆倾斜、筒体连接面磨损、螺杆向前蹿动、油脂注入量不足。总结出新的故障处理(螺旋机结构优化、渣土改良、合理选择螺旋机转速、防止空仓掘进、严控加工工艺等)与预防措施(螺旋机叶片修复、改善油脂注入量、更换损坏部件)。为今后盾构施工中处理螺旋输送机驱动密封故障处理与防护技术提供依据。

  16. Design of Scraper Conveyor Condition Monitoring System based on ARM%基于ARM的刮板输送机状态监测系统的设计

    Institute of Scientific and Technical Information of China (English)

    于平; 刘曦永; 小云

    2015-01-01

    针对刮板输送机传动系统的故障率较高,设计了基于ARM的刮板输送机状态的监测系统,其处理器采用的是英创生产的ARM9 EM9161,并结合数据采集装置和无线信号传输模块,实现了对电动机和减速器相关重要参数的监测报警。文中讲述了系统的硬件构成, WinCE的软件环境等。该设计将应用于煤矿状态监测领域,具有很好的应用价值。%The paper is designed the state of scraper conveyor monitoring system based on ARM for the high failure rate of scraper conveyor drive system. The system uses ARM9 EM9161 development board produced by YingChuang company, combines with data acquisition devices and wireless signal transmission module, realizes the important parameters related to the motor and gear unit to monitor alarming. The paper describes the configuration of the system's hardware, software envi-ronment of WINCE and so on. The design will apply to the field of early-warning and monitoring in mine, and have very good value.

  17. Improvement Design of Tension Device for Tail of Scraper Conveyor%刮板运输机机尾张紧装置的改进

    Institute of Scientific and Technical Information of China (English)

    敖剑忠; 敖金龙

    2014-01-01

    坪湖矿洗煤厂的刮板运输机尾张紧调节通常采用丝杆-滑块拉紧装置,其所处环境差,设备易腐蚀,使得机尾调节难度较大,严重影响设备的正常使用,给设备运行留下了安全隐患。洗煤厂根据自身条件对设备进行改进,研制出蜗轮蜗杆减速器张紧装置,使得机尾调节变得安全、方便、快捷,获得了成功应用。%The lead-screw -slider tension device used to be used in tension adjustment for the tail of scraper conveyor in Pinghu Coal Washing Plant .The poor environmental conditions and perishable equipment made the tail adjustment difficult ,which seriously affected the normal use of equipment and left safety hazards for equip-ment running .The paper presents the improvement design of tension device for the tail of scraper conveyor , which has made the tail adjustment safe ,convenient and fast .

  18. Development of Parameter Design System of Screw Conveyor%螺旋输送机参数设计系统的开发

    Institute of Scientific and Technical Information of China (English)

    刘海军; 孙井坤; 郑先哲

    2012-01-01

    Parameter design of screw conveyor was realized according to the computation model of screw convey or parameters on platform of Visual Basic 6.0 with object oriented programming. Overall function of system, design of process, and the implementation technique of every functional module were discussed. Developing and running environment of the system were introduced. Parameters according with different working conditions can be designed using the system, which makes design work of screw conveyor fast and exact.%根据螺旋输送机参数计算的数学模型,在Visual Basic6.0的平台下,利用面向对象的程序设计,实现了螺旋输送机的参数计算设计。讨论了系统总体功能及流程的设计以及各主要功能模块的实现技术,并阐述了系统的开发和运行环境。该系统能够设计出符合不同工作条件的螺旋输送机参数,使螺旋输送机的设计工作快速、准确。

  19. Análisis de la fuerza axial en un transportador de sinfín // Analysis of axial force in a screw conveyor.

    Directory of Open Access Journals (Sweden)

    F. Aguilar Parés

    1999-01-01

    Full Text Available Durante el movimiento de un material en un transportador de sinfín surge una fuerza en dirección axial que influye en laselección de uno de los cojinetes de apoyo del equipo. En el artículo aparecen algunas soluciones constructivas que tienen encuentan la fuerza axial. Por otro lado se establece la relación entre la fuerza axial y el empuje axial y se precisa de quiendepende el sentido del empuje axial. Por último se propone un modelo matemático que relaciona la fuerza axial con la potenciarequerida por el equipo.Palabras claves: Transportador de sinf in, fuerza axial , empuje axial ._________________________________________________________________________AbstractDuring the movement of material in a screw conveyor surge a force in axial direction that influence in the selection of one ofthe equipment support bearings. Some constructive solutions appear in the article for considering the axial force. In the otherhand it is established the relation between axial force and axial thurst and it is precised whose direction thurst axial depend of.Finally it is proposed a mathematic model that relates the axial force with the power required by the equipment.Key words: Screw conveyor, axial force, axial thurst .

  20. The need for sustainable technology diffusion in mining: Achieving the use of belt conveyor systems in the German hard-rock quarrying industry

    Directory of Open Access Journals (Sweden)

    Tobias Braun

    2017-01-01

    Full Text Available The movement of raw materials can be one of the most challenging tasks in open pit mining, with truck transportation representing the largest factor in mining costs and resulting in major greenhouse gas (GHG emissions. In this study, the transportation methods of bulk materials within German hard-rock open pit mines were investigated. Approximately 450 quarries were studied for their production tonnage, lease areas, mined rock type as well as mining methods and processing equipment. The results demonstrate that 90% of the operations use truck-based transportation methods, with the remainder relying partly or completely on continuous conveyor-based systems. The installation of continuous conveyors compared to trucks represents a real alternative because of reduced dead load, reduced GHG emissions and in many cases even reduced costs. Thus, for in-pit haulage in quarries sustainable technology substitutions exist that are yet to be adopted by the German quarrying industry. As this study shows, in the future the diffusion of sustainable technologies requires site champions and large-scale case studies that demonstrate their successful introduction in the mining value chain.

  1. 刮板输送机中部槽联接结构的尺寸设计%Dimension Design of Line-Pan Connector on Scraper Conveyor

    Institute of Scientific and Technical Information of China (English)

    闵令江; 于贵

    2011-01-01

    The deflection between neighboring line-pans,both in horizontal and vertical direction,of the scraper conveyor are mainly restricted by the structural dimensions of line-pan connector,including dumbbell-pin,line-pan head and long hole of pin-rack seat.The design of these dimensions is always done graphically,directly determines on the service life of the line-pan and the performance of whole conveyor.%刮板输送机相邻中部槽水平方向和垂直方向的相对偏转主要受哑铃销、中部槽端头及销轨座长孔的尺寸限制,直接影响中部槽的使用寿命和整个刮板输送机的工作性能,采用作图法设计刮板输送机中部槽联接结构尺寸。

  2. Development of Bonding Compound for Steel Cord Conveyor Belt%钢丝绳芯输送带粘合胶的研制

    Institute of Scientific and Technical Information of China (English)

    曲成东

    2011-01-01

    The bonding compound of steel cord conveyor belt was developed. The optimized formulation was as follows: NR 60, SBR 20, BR 20, carbon black N220 40, silica 15, zinc oxide 5, stearic acid 1, pine tar 7, antioxidant 4010NA/BLE-C 1/1. 5, adhesive RS/A 3/2. 5, cobalt boroacylate 2. 2,sulfur 2. 5,accelerator CZ 1. 2. The compound with optimized formulation possessed good comprehensive properties and excellent adhesion property,and met the application requirements in steel cord conveyor belt.%研制钢丝绳芯输送带粘合胶.粘合胶的优化配方为:NR 60,SBR 20,BR 20,炭黑N220 40,白炭黑15,氧化锌 5,硬脂酸 1,松焦油 7,防老剂4010NA/BLE-C 1/1.5,粘合剂RS/A 3/2.5,硼酰化钴 2.2,硫黄2.5,促进剂CZ 1.2.优化配方胶料综合性能良好,粘合性能优异,能够满足钢丝绳芯输送带使用要求.

  3. Study on application of high-speed idlers of conveyors%带式输送机高速托辊的应用研究

    Institute of Scientific and Technical Information of China (English)

    刘振; 包继华; 黄世鼎; 郭锋; 王领

    2011-01-01

    After analyzing the application status of the belt conveyor and the idler, the necessity of developing high-speed idlers is proposed. Based on the study of such components as idler shaft, bearing, sealings and bearing pedestal, such key issues of high-speed idlers as radial mn-out, rotary resistance and employment lifespan are discussed, which offers theoretical basis for the design and application of the high-speed idler and the highspeed belt conveyor.%通过对带式输送机及托辊的应用现状进行分析,提出了研发带式输送机高速托辊的必要性.通过对托辊主轴、轴承、筒体、密封结构和轴承座等各部分结构进行研究,探讨了高速托辊在径向圆跳动、旋转阻力和使用寿命等方面要解决的关键技术,为高速托辊以及高速带式输送机的设计应用提供理论基础.

  4. Design and calculation of Scew Conveyor%基于螺旋输送机的设计计算

    Institute of Scientific and Technical Information of China (English)

    李彦

    2014-01-01

    此螺旋输送机的设计主要用于饲料的传送,根据给定的输送量以及物料特性分别进行叶片用料实形、螺旋直径、螺旋转速等主要参数的设计计算。传动部分采用电动机带动皮带,皮带带动一级减速器、减速器连接机体的传动方式。根据计算得出的主要参数选择合适的电动机,从而确定带轮以及减速器的传动比,将主要后续工作引向一级减速器的设计,其中包括主要传动轴的校核、齿轮的选择等计算工作。最后根据计算所得结果整理出安装尺寸以及装配图的绘制。%The screw conveyor is mainly designed to convey feed. Design and calculate the real shape of material, the diame-ter of screw, screw speed and other main parameters of the blade respectively according to the given conveying capacity and ma-terial properties. The transmission part starts with a motor driving belt,and then the transmission belt driving first-level reducer and the connection body of reducer. Select appropriate motor according to the main parameters calculated, and then determine the conveying ratio of belt pulley and reducer. The design of driving main follow-up work to a reducer, includes checking of main transmission shafts the selection of gears and other calculation. Finally, sort out the installation dimensions and draw assembly drawing according to the results calculated.

  5. 伸缩带式输送机中问卸载式多点驱动装置的设计%The design of middle unload and multipoint driving device of extensible type belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈文

    2011-01-01

    The article introduces the technological achievements and economic benefits of middle unload and multipoint driving of extensible type belt conveyor.%介绍伸缩带式输送机中间卸载式多点驱动装置的设计、应用,以及具有良好的技术和经济效益。

  6. Contacts Finite Element Analysis of the Conveyor Chain of Cooling Transporter based on ANSYS%基于ANSYS的冷却运输机输送链接触有限元分析

    Institute of Scientific and Technical Information of China (English)

    马鸿峰

    2011-01-01

    利用Pro/Engineer软件建立了冷却运输机输送链的三维实体模型,然后导入到ANSYS软件中.基于ANSYS软件,采用有限元接触分析方法对冷却运输机滚子输送链进行有限元接触分析,找出了输送链的危险区域和薄弱环节,其结果对冷却运输机输送链的优化设计具有一定的指导意义.%the three-dimensional solid model of the cooling transporter conveyor chain by means of the Pro/Engineer software was built. Then the model af the cooling transporter conveyor chain in Pro/Engineer is changed as finite element model in ANSYS software through the software interface between Pro/ Engineer and ANSYS. Based on the ANSYS software, we used the method of the finite element analysis to analyze the contacts finite element of the cooling transporter conveyor chain, found out the danger section and weaknesses. The results can instruct the optimization design of the cooling transporter conveyor chain.

  7. Design of Belt Conveyor Control System Based on PLC SIEMENS S7-200%基于PLC西门子S7-200的带式输送机控制系统设计

    Institute of Scientific and Technical Information of China (English)

    李博

    2015-01-01

    Belt conveyor is a conveyor belt driven by the driving roller, as a continuous conveying equipment, which is one of the main transport equipment in modern mines. In particular, the modern large-scale coal mines, coal transportation is mainly through the conveyor to complete. Conveyor is characterized by large transmission capacity, small power consumption, simple structure, strong adaptability to the material, easy to form water production line, so that the enterprise production process to achieve mechanization. Belt conveyor in coal mine and coal preparation plant plays a important role, under the background of enterprise development of coal mining mechanization, automation, automatic control operation of the conveyor belt is particularly important. In this paper, the design and programming of the conveyor system are carried out with the SIEMENS S7-200 programmable controller as an example.%带式输送机是一种由驱动滚筒带动的输送带,作为一种连续输送的设备,其是现代矿井的主要运输设备之一.尤其是现代化大型的煤矿,煤的运输主要通过输送机来完成.输送机的特点是输送能力大,功耗小,构造简单,对物料的适应性强,便于组成流水生产线,使企业生产过程实现机械化.带式输送机在煤矿及洗煤厂发挥着重要作用,在企业发展采煤机械化、自动化的背景下,带式输送机的自动控制运行显得尤为重要.本文以西门子S7-200可编控制器为例进行输送机系统的编程和设计.

  8. Application of plasma cladding remanufacturing technology on scraper conveyor%刮板输送机等离子熔覆再制造强化技术的应用

    Institute of Scientific and Technical Information of China (English)

    秦文光

    2016-01-01

    为了解决刮板输送机因磨损失效、使用寿命短的问题,对刮板输送机失效形式进行了分析,采用等离子熔覆技术对磨损的刮板输送机进行耐磨再制造强化处理,研究了刮板输送机等离子熔覆再制造在工业生产中的应用。结果表明,等离子熔覆再制造技术成功应用于工业生产,能显著提高刮板输送机的耐磨性能,可有效延长其使用寿命,具有重要的工业推广应用价值,社会效益显著。%In order to solve the scraper conveyor for wear failure and short service life,the failure forms of scraper conveyor were ana⁃lyzed,the plasma cladding wear resistance technology was used to wear resistance remanufacturing and strengthening treatment of the scraper conveyor,the application of the plasma cladding remanufacturing of the scraper conveyor in industrial production was studied. The results show that the plasma cladding remanufacturing technique was successfully applied in industrial production,can greatly im⁃prove the wear resistance of the scraper conveyor,effectively prolong the service life.Moreover,it has more important promotion prospects and good application value.

  9. 螺旋叶片对垂直螺旋输送机性能的影响%Influence of screw blade of performance for vertical screw conveyor

    Institute of Scientific and Technical Information of China (English)

    余书豪; 谌永祥

    2016-01-01

    为了研究在垂直螺旋输送机物料输送过程中的细观甚至微观特征,降低颗粒输送过程中近轴处的涡流引起的能耗,增大近壁面处的轴向速度,考察不同母线形状的螺旋叶片,借助颗粒仿真软件EDEM 2.5进行数值试验,模拟垂直螺旋输送机内颗粒速度、功率消耗、能量耗散、质量流量等性能指标,通过数据处理软件Origin Pro 8.0作图分析各项指标的变化情况.结果表明:与传统直线型母线的螺旋叶片相比,弯曲型母线的螺旋叶片在近轴处的切向速度减小73.87%,大大降低近轴处的涡流效应;近壁面处的轴向速度在高转速时增大12.34%,完成预定输送任务基础上,有效地降低额外的能量消耗,提升整机性能.%In order to figure out the meso and microscopic characteristics during bulk material being conveyed within the vertical screw conveyor and reduce the swirl flow near the screw shag and increase the axial velocity of particles near the wall during the particulate being conveyed,the different shape screw blades were surveyed,by means of the software of particle simulation EDEM 2.5,numerical test was done,the standards of performance such as particle velocity,power consumption,energy dissipation and average mass flow rate within the vertical screw conveyor were simulated.The trend charts were plotted based on the data processing software Origin Pro 8.0,to analysis the changes of indicators.The result shows that compared with the line type screw blade,the curved screw blade of tangential velocity near the shaft is reduce by 73.87%,the vortex motion decreases evidently.The axial velocity near the wall is increased by 12.34%,the extra energy dissipation effectively reduces on the basis of finishing the intended work,which promotes the whole performance of vertical screw conveyor

  10. Nanoscale mass conveyors

    Science.gov (United States)

    Regan, Brian C.; Aloni, Shaul; Zettl, Alexander K.

    2008-03-11

    A mass transport method and device for individually delivering chargeable atoms or molecules from source particles is disclosed. It comprises a channel; at least one source particle of chargeable material fixed to the surface of the channel at a position along its length; a means of heating the channel; and a means for applying an controllable electric field along the channel, whereby the device transports the atoms or molecules along the channel in response to applied electric field. In a preferred embodiment, the mass transport device will comprise a multiwalled carbon nanotube (MWNT), although other one dimensional structures may also be used. The MWNT or other structure acts as a channel for individual or small collections of atoms due to the atomic smoothness of the material. Also preferred is a source particle of a metal such as indium. The particles move by dissociation into small units, in some cases, individual atoms. The particles are preferably less than 100 nm in size.

  11. 带式输送机驱动滚筒的应力分析%Stress analysis of driving drum of belt conveyor

    Institute of Scientific and Technical Information of China (English)

    刘金依; 薛河; 聂文杰

    2001-01-01

    采用大型有限元分析软件ANSYS,对带式输送机驱动滚筒的应力分布规律进行了计算和分析,从理论上对滚筒的常见破坏形式进行了分析研究,为进一步改进滚筒的受力状况,实现滚筒的标准化生产提供了必要的理论依据。%This paper calculates and analyses the stress distributing rule of the driving drum of belt conveyor by using ANSYS software,and investigates the usual destroying forms of it in theory,and provides essential theoretic gist for improving its suffering force situation and realizing its standardization production.

  12. 冰晶石湿料螺旋输送机的故障分析%Fault analysis of screw conveyor for transporting wet material of cryolite

    Institute of Scientific and Technical Information of China (English)

    业文成

    2012-01-01

    LS型螺旋输送机输送冰晶石湿料常发生螺旋轴扭断故障,分析故障产生的原因,介绍为防止螺旋输送机故障在管理、物料及设备方面所采取的整改措施,达到了设备稳定运行的效果。%The LS type screw conveyor for transporting wet material of cryolite screw shaft, the reasons of the fault are analyzed, the rectification measures in usually happen twist off of management, materials and equipment of the action for preventing fault are introduced, achieving the stable operation of the equipment.

  13. 螺旋输送机在固废处理中的应用与展望%Application and Prospect of Screw Conveyor in Solid Waste Disposal

    Institute of Scientific and Technical Information of China (English)

    柴彬; 闫志海; 魏少华; 葛砚; 唐滨

    2016-01-01

    螺旋输送机具有结构简单、横截面积小、密封性好、操作方便、维修容易、便于封闭运输等优点。简要介绍了螺旋输送机的结构组成和工作原理及其在飞灰处理、除臭卸料、垃圾渗沥液等固废处理方面的应用。%The screw conveyor has advantages of simple structure,small cross-sectional area,good sealing,convenient operation,easy to maintain and enclosed conveying,etc.This article briefly introduces its structure,working principle and application in solid waste disposal such as fly ash handling,deodorant discharge and leachate treatment.

  14. 圆管带式输送机压陷阻力的计算方法%Method of calculating indentation resistance of tubular belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈洪亮; 熊爽

    2013-01-01

    通过分析圆管带式输送机的托辊组与输送带之间的作用关系,得出圆管带式输送机的压陷阻力是圆管状输送带与圆柱形辊子的空间接触产生的,应采用二维模型计算压陷阻力.通过DEM仿真方法分析了不同充填率下物料在托辊组各个辊子上的正压力分布,采用Nuttall基于广义的Maxwell二维模型计算式,应用MATLAB通过迭代方法计算压陷阻力矩,进而实现对压陷阻力和压陷阻力系数的计算.%After analyzing the interaction between idler group and belt of the tubular belt conveyor,the paper concluded that the indentation resistance of the tubular belt conveyor produced due to the spatial contact between tubular belt and cylindrical idler,so 2D model should be applied to calculation of the indentation resistance.In addition,DEM simulation method was used to analyze the distribution of normal pressure on each idler at various material filling rate.Calculation formula of 2D Nuttall model based on generalized Maxwell model and MATLAB iteration method were used to calculate the indentation resistance moment,so as to calculate the indentation resistance and indentation resistance coefficient.

  15. Dynamic Conveyor Tracking for Delta Robot%基于 Delta 并联机器人的传送带动态跟踪

    Institute of Scientific and Technical Information of China (English)

    邓明星; 刘冠峰; 张国英

    2015-01-01

    Delta并联机器人是最典型的空间三自由度移动的并联机构,其在3C电子产品行业、食品包装行业、生物制药行业均得到了广泛的应用。主要以Delta并联机器人为研究对象,通过视觉系统定位物体的位姿,再结合传送带编码器的位置反馈信息,计算出物体在机器人坐标系下面的实时位姿。实验结果表明,机器人在位置模式下,通过改进后的PID算法,能预测传送带上物体的位姿,并实时调整自身移动速度和末端位姿来跟踪传送带上的物体,最终实现对目标的动态跟踪抓取。%The Delta parallel robot is the most typical space moving parallel mechanism which has three degree of freedom .It is widely used in 3C electronic products ,food packaging and pharmaceutical packaging .In this paper ,Delta parallel robot was taken as study objective ,the pose of the object was got by machine vision system ,which was coupled with the position feedback information of conveyor encoder ,then the object’s real-time pose in the robot coordinate was calculated .The experiment results show that the robot can predict the object’s pose on the conveyor belt ,adjust its speed and pose by the improved PID algorithm in the position mode ,realize the dynamic tracking fetch of the target finally .

  16. A case study on the formation and evolution of ice supersaturation in the vicinity of a warm conveyor belt's outflow region

    Directory of Open Access Journals (Sweden)

    P. Spichtinger

    2005-01-01

    Full Text Available A case study is presented on the formation and evolution of an ice-supersaturated region (ISSR that was detected by a radiosonde in NE Germany at 06:00 UTC 29 November 2000. The ISSR was situated in the vicinity of the outflow region of a warm conveyor belt associated with an intense event of cyclogenesis in the eastern North Atlantic. Using ECMWF analyses and trajectory calculations it is determined when the air parcels became supersaturated and later subsaturated again. In the case considered, the state of air parcel supersaturation can last for longer than 24h. The ISSR was unusually thick: while the mean vertical extension of ISSRs in NE Germany is about 500m, the one investigated here reached 3km. The ice-supersaturated region investigated was bordered both vertically and horizontally by strongly subsaturated air. Near the path of the radiosonde the ISSR was probably cloud free, as inferred from METEOSAT infrared images. However, at other locations within the ISSR it is probable that there were cirrus clouds. Relative humidity measurements obtained by the Lindenberg radiosonde are used to correct the negative bias of the ECMWF humidity and to construct two-dimensional maps of ice supersaturation over Europe during the considered period. A systematic backward trajectory analysis for the ISSRs on these maps shows that the ISSR air masses themselves experienced only a moderate upward motion during the previous days, whereas parts of the ISSRs were located just above strongly ascending air masses from the boundary layer. This indicates qualitatively that warm conveyor belts associated with mid-latitude cyclogenesis are disturbances that can induce the formation of ISSRs in the upper troposphere. The ISSR maps also lead us to a new perception of ISSRs as large dynamic regions of supersaturated air where cirrus clouds can be embedded at some locations while there is clear air at others.

  17. A case study on the formation and evolution of ice supersaturation in the vicinity of a warm conveyor belt’s outflow region

    Directory of Open Access Journals (Sweden)

    P. Spichtinger

    2004-12-01

    Full Text Available A case study is presented on the formation and evolution of an ice-supersaturated region (ISSR that was detected by a radiosonde in NE Germany at 06:00 UTC 29 November 2000. The ISSR was situated in the vicinity of the outflow region of a warm conveyor belt associated with an intense event of cyclogenesis in the eastern North Atlantic. Using ECMWF analyses and trajectory calculations it is determined when the air parcels became supersaturated and later subsaturated again. In the case considered, the state of air parcel supersaturation can last for longer than 24 h. The ISSR was unusually thick: while the mean vertical extension of ISSRs in NE Germany is about 500 m, the one investigated here reached 3 km. The investigated ice-supersaturated region was bordered both vertically and horizontally by strongly subsaturated air. Near the path of the radiosonde the ISSR was probably cloud free, as inferred from METEOSAT infrared images. However, at other locations within the ISSR it is probable that there were cirrus clouds. Relative humidity measurements are used to correct the negative bias of the ECMWF humidity and to construct two-dimensional maps of ice supersaturation over Europe during the considered period. A systematic backward trajectory analysis for the ISSRs on these maps shows that the ISSR air masses themselves experienced only a moderate upward motion during the previous days, whereas parts of the ISSRs were located just above strongly ascending air masses from the boundary layer. This indicates qualitatively that warm conveyor belts associated with mid-latitude cyclogenesis are disturbances that can induce the formation of ISSRs in the upper troposphere. The ISSR maps also lead us to a new perception of ISSRs as large dynamic regions of supersaturated air where cirrus clouds can be embedded at some locations while there is clear air at others.

  18. 沥青混合料保温车螺旋输送机结构设计和仿真%Design and Simulation of the Screw Conveyor for Asphalt Mixing Material Insulation Vehicle

    Institute of Scientific and Technical Information of China (English)

    高长银; 虞正平; 吴晓铃

    2013-01-01

    针对沥青混合料保温车螺旋输送机,从速度分析入手,应用数学方法推导出螺旋输送机的轴向运动速度和圆周速度,从而进一步推导出螺旋轴转速、螺旋叶片直径、螺旋螺距等计算公式,进而完成沥青混合料螺旋输送机参数设计.最后,运用工程流体力学软件EFD软件建立了螺旋输送机内物料流动分析模型,对沥青混合料流动过程进行数值模拟,结果表明,输送机工作时将能带动物料混合搅拌,但由于出口处空间限制,要靠螺旋面挤出卸料,应尽可能减少伸出尺寸.%For the screw conveyor of the asphalt mixture insulation vehicle,by means of the mathematical methods the axial movement speed and the circumferential speed of the screw conveyor are derived,and then the calculation formula of the spiral shaft rotation speed,helical blade diameter and pitch are deduced.According to the calculation formula,the design parameters of the screw conveyor of the asphalt mixture insulation vehicle are calculated.Finally,by using of Engineering Fluid Dynamics software the material flow analysis model of the screw conveyor is established,and the flow field of asphalt mixing material is simulated.The results show that the screw conveyor can stir and mix the materials,as a result of exit space limitation the material is dumped by screw extrusion and should minimize the extend size.The reference for the selection,design and optimization of the screw conveyor will be provided by the research results.

  19. 纳米材料在输送带覆盖胶中的应用研究进展%Study on Application of Nanometer Materials in the Covering Rubber of Conveyor Belt

    Institute of Scientific and Technical Information of China (English)

    臧亚南

    2014-01-01

    简要介绍了层状硅酸盐、纳米金属氧化物和氢氧化物在输送带覆盖胶中的应用,对各种纳米材料对输送带覆盖胶的性能影响进行了综述,并对今后的发展进行了展望。%The application of layered silicate, metal oxide nanocrystallines, nano -hydroxide in the covering rubber of conveyor belt were introduced. The properties of nanometer materials in the the covering rubber of conveyor belt were also summarized. And the future development was prospected.

  20. 高温水冷倾斜25°螺旋输送机的设计与应用%Design and Application of Water-cooled Screw Conveyor Inclined at 25°

    Institute of Scientific and Technical Information of China (English)

    王一冰; 杨志勇

    2015-01-01

    针对3 M W循环流化床锅炉岛系统热态试验台工程设计了高温水冷倾斜25°螺旋输送机。介绍了高温水冷倾斜25°螺旋输送机的主要参数、输送工艺和结构特点。%Aiming at the thermalstate test rig for boiler island system of 3 MW circulating fluidized bed ,we design a 25° inclined screw conveyor cooled by water .This paper introduces the main parameters ,process and structure features of the water‐cooled screw conveyor inclined at 25° .

  1. Analysis on Earth Conveying and Pressure Maintaining of Screw Conveyors of EPB Shields%土压平衡盾构螺旋输送机排土及保压作用分析

    Institute of Scientific and Technical Information of China (English)

    周冠南

    2012-01-01

    The earth conveying and pressure maintaining of screw conveyors play an important role in the safe and effi- cient boring of EPB shields. The working principles and influencing factors of the earth conveying and pressure maintai- ning of screw conveyors are systematically analyzed. Conclusions drawn are as follows : 1 ) The earth pressure balance in the boring of EPB shields includes the pressure balance between inside chamber and outside chamber, the pressure bal- ance inside the screw conveyor, and the earth input/output volume balance, which can be realized by controlling the volume of earth conveyed. 2) When the earth enters the screw conveyors, the water/soil pressure in the chamber is re- sisted by the gravity of the earth and the friction with the screw rod, lamina and the inner side of the conveyor, so as to keep stable earth conveying. 3 ) The earth behavior, which has great influence on the earth conveying and pressure maintaining of screw conveyors, can be improved by injecting ground conditioning agents into areas ahead of the cutter heads and into the chamber. 4) Regarding the structure of the screw conveyor, the pressure maintaining effect can be improved by means of reducing the pitch, adopting discontinuous screw and double screw conveyors.%螺旋输送机的排土和保压作用的发挥对土压平衡盾构的施工安全与效率有重要影响,对其作用机制及影响其作用发挥的因素进行系统的理论分析,并参考工程实测数据,得出以下结论:1)盾构施工中的土压平衡包括土仓内外与螺旋输送机内的压力平衡和进、出土量的平衡,其通过螺旋输送机排土量的控制来实现;2)渣土进入螺旋输送机后,依靠自身重力及与螺杆、叶片和筒壁界面间的摩擦作用来抵抗土仓内的水土压力,保持出渣过程的稳定性;3)渣土性质对螺旋输送机的排土和保压效果有较大影响,主要通过向刀盘前方和土仓内添加改良材料的

  2. 硅铁除尘系统中螺旋输灰机构参数的选择%SELECTION OF PARAMETERS OF SCREW CONVEYOR IN BAG HOUSE DUST COLLECTOR IN FeSi FURNACE

    Institute of Scientific and Technical Information of China (English)

    卢鹏翔

    2001-01-01

    The screw conveyor was adopted in bag house dust collector in 12.5MVA FeSi furnace,and its parameters were calculated and selected.The practice showed that the screw conveyor runned well,the service effect was good.%12.5MVA硅铁炉布袋反吸烟气净化系统中采用了螺旋输灰机构,并对输灰机构的参数进行了计算和选择。经生产中使用,螺旋输灰机运行良好,取得了较好的使用效果。

  3. 长距离胶带机在水电工程砂石料系统工程中的应用%Application of Long-distance Rubber Belt Conveyor in Aggregate & Sand Processing System of Hydropower Projects

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    文章从长距离胶带机的设计、施工要求及在国内外各个工地的砂石料生产中的应用等方面,对长距离胶带机的使用进行综合性比较,论证了长距离胶机在水电工程中应用的推广意义。%Application of the long-distance rubber belt conveyor is comprehensively compared, and the development significance of the conveyor in the hydropower projects is demonstrated in terms of its design, construction requirements and its applications in the aggregate&sand processing operation on the hydropower projects site both at home and abroad.

  4. Current methods and possibilities to determine the variability of Cu content in the copper ore on a conveyor belt in one of KGHM Polska Miedz S.A. mines

    Directory of Open Access Journals (Sweden)

    Jurdziak Leszek

    2016-01-01

    Full Text Available In this paper the methodology of ore sampling on a belt conveyor in one of KGHM Polska Miedz S.A. mines was presented together with the results of analysis of the variation of ore tonnage and quality. The ore was transferred from one mine to another one through the analysed transfer conveyor on the route from the mine Division of Mining to copper plants. The transported ore was sampled in person from Division of Concentrators on a regular basis for metal accounting purposes between both mines. The ore quality control became a significant problem since it is impossible to predict with satisfactory advance both Cu content in the feed as well as its lithology composition which is required to improve and optimise the enrichment efficiency.

  5. Comparison of sliding friction and wear behaviour of overhead conveyor steels tested under dry and lubrication conditions; Comportamiento frente al desgaste y friccion de aceros empleados en lineas de manutencion aerea ensayados con y sin lubricacion

    Energy Technology Data Exchange (ETDEWEB)

    Castro-Regal, G.; Fernandez-Vicente, A.; Martinez, M. A.

    2005-07-01

    The sliding friction and wear behaviour of different steel qualities were investigated with and without lubrication conditions. Steel qualities tested are normally used in the overhead conveyor system of many industrial fields, like the automotive sector. Sliding wear tests have been conducted by means of a pin-on-disk machine. A 100Cr6 steel similar to that used within the overhead conveyor trolleys has been employed as a pin. Friction coefficient values obtained under lubrication conditions were three times smaller than those obtained without lubrication. The mechanism that controls wear behaviour under lubrication conditions is an abrasive one and the wear values obtained are almost worthless. On the other hand, mechanism controlling wear during non lubrication tests, was a combination of abrasion and adhesion. (Author) 20 refs.

  6. Design and Application of New High-pressure Sealing Screw Conveyor%新型高压密封螺旋输送机的设计与应用

    Institute of Scientific and Technical Information of China (English)

    杨丽珍; 钟少振; 张晓冬

    2011-01-01

    螺旋输送机主要用于输送各种粉状、粒状、小块状等散状物料,常用于食品、化工、煤炭、建筑 及冶炼等工业.随着新工艺新技术的发展,在化工及冶炼行业常伴有高压有毒有害气体,对螺旋输送机性能提出了新的要求.天津赛瑞机器设备有限公司为满足市场需求研发出一种适用于输送过程中伴有高压及密封要求的新型高压密封螺旋输送机.本文介绍了该高压密封螺旋输送机的主要参数、输送工艺和结构技术特点.%High-pressure sealing screw conveyor is a kind of machine for carrying materials of a variety of powder,grain and little nub, which is common in the industries of food, chemistry, coal, construction and smelting. Gencrally is accompanied with high pressure noxious gas in chemistry and smelting industry, the development of new process and technology new demands of screw conveyor's performance will be occurred. Our company researched and designed a new type of highpressure sealing screw conveyor with requirements of high-pressure and sealing to satisfy market's demand. The paper introduced the main parameter, carrying process and structure specifics of high-pressure sealing screw conveyor.

  7. The Design of PLC Control Programs of Screens and Spiral Conveyors%格栅除污机及螺旋输送机PLC控制程序设计

    Institute of Scientific and Technical Information of China (English)

    谢凯; 袁鹏; 王明军

    2011-01-01

    本文分析了污水提升泵站格栅除污机及螺旋输送机自动控制运行原理,以西门子S7-300系列PLC为例,设计出了PLC控制程序.%This paper analy es the automatic operation principle of screens and spiral conveyors at wastewater pumping stations,designs the PLC control programs based on S7-300 of Siemens.

  8. DSJ100/100/3×200型顺槽带式输送机的研制%Development of DSJ1 00/1 00/3 ×200 Type Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    赵世旭

    2014-01-01

    Aiming at the transportation requirements of special roadway and universality of series product in Xis-han coal and electricity (group)company,on the basis of digestion and absorption the experience of traditional belt conveyor,through optimization design of the existing DSJ100 series tunnel extensible belt conveyor in Xishan coal and electricity group electromechanical factory,a new kind of belt conveyor is developed,which is safe,reliable and en-ergy saving.Introduces through adopting the key techniques such as variable frequency conversion start mode,the new integral base,unloading intermediate drive,the fast disassembly fuselage and so on,adaptability,safety reliabili-ty and economy of belt conveyor to severe environment in the underground of coal mine is improved effectively.%针对西山煤电(集团)公司矿井特殊巷道运输要求和产品系列的通用性,在消化和吸收传统顺槽带式输送机经验的基础上,对西山机电厂现有DSJ100系列顺槽可伸缩带式输送机进行了优化设计,研制开发出了一种安全、可靠、节能的新型带式输送机。介绍了通过采用变频调速启动方式、新式整体底座、卸载式中间驱动、快速可拆卸机身等关键技术,有效提高了带式输送机对煤矿井下恶劣环境的适应能力、安全可靠性及经济性。

  9. 水峪煤业主斜井带式输送机盘式制动器改造应用研究%Applied research on disk brake for belt conveyor on main inclined shaft on Shuiyu coal

    Institute of Scientific and Technical Information of China (English)

    杨贵生

    2014-01-01

    In order to ensure the safe operation of main shaft belt conveyor, on the basis of analyzing the existing disc brake pump and electric control device and the existing problems, combined with Shuiyu Coal Mine Inclined Belt Conveyor's parameters and the actual operating conditions, put forward the advanced reconstruction scheme for the pump station of the conveyor of disc brake main shaft that used N+1 circuit braking system, instantaneous working system, and made the transformation with the electronic control device together. By the transformation of the system, and ensure safe and stable operation.%为了保证主斜井带式输送的安全运行,在充分分析现有盘式制动泵站和电控装置存在问题的基础上,结合水峪煤业主斜井带式输送的参数及实际运行工况,提出主斜井带式输送机盘式制动器泵站为N+1回路制动系统、瞬时工作制等先进改造方案,并对电控装置一并改造。通过改造保证系统安全可靠稳定运行。

  10. 井下B1000带宽带式输送机传动部受力分析%Stress Analysis of Underground B1000 Broadband Belt Conveyor Drive Unit

    Institute of Scientific and Technical Information of China (English)

    马雁翔

    2013-01-01

    First broadband meter belt conveyor, for instance describes the design parameters of the belt conveyor, and the spread portion of the structure. Secondly, the size of the load on the drive the bear were calculated. Finally, the Ministry of transmission through finite element analysis software force analysis of each component strength of the belt conveyor drive unit for check verification theory, provide a reference for future manufacturing.%  首先以带宽一米的带式输送机为实例介绍带式输送机的设计参数,以及传动部的结构。其次,对传动部的承受载荷的大小进行了计算。最后,通过有限元分析软件对传动部进行了受力分析,从理论上对带式输送机传动部各部件强度进行校核验证,为以后的生产制造提供参考依据。

  11. Discussion on Energy Saving of Converter Used in Belt Conveyor in Coal Mine%关于煤矿皮带机变频器节能的探究

    Institute of Scientific and Technical Information of China (English)

    胡晨飞

    2015-01-01

    Coal belt conveyor has relations with the transport of coal supplies and reduction losses in transport, and extending the life of the belt and so on, which has important significance for the mine development. In view of this, this paper mainly researched on energy-saving of converter used in belt conveyor in coal mine in order to deepen understanding of the coal belt drive, and improve application quality of coal belt conveyor.%煤矿皮带机关系着原煤物资运输、降低运输过程中的损耗、延长皮带使用寿命等,对煤矿发展具有重要的意义。鉴于此,主要就煤矿皮带机变频器节能进行研究,希望加深对煤矿皮带变频器的了解,提升煤矿皮带机的应用质量。

  12. Power Consumption and Experimental Study of Maize Straw Screw Conveyor%螺旋输送装置输送玉米秸秆功耗研究

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光; 谢胜仕; 赵圆圆

    2015-01-01

    In order to reduce the power consumption of the screw conveyor and increase its conveying efficiency , the the-oretical analyzing method and experimental research were used to establish the mathematical models of the power con -sumption which suitable for the different conveying state .The effects of screw rotational speeds and the feeding rates on power consumption and productivity ratio were studied by experimental study .The results show that the conveying power consumption increases 5~9 W when the rotational speed increased 10 r/min ( filling rate is fixed value ) , and the conve-ying power consumption increases 10~12W when the filling rate increased 0.1kg/s(rotational speed is fixed value).The experimental results still prove that the screw conveyor has the highest productivity ratio :0 .704~0 .714 kg/W when the moisture content of material is 24%, the rotational speed and filling rate are 120r/min and 0.88kg/s respectively.At the same time , the mechanical properties of materials to be delivered with the change of moisture content and the effects of moisture content on the power consumption were studied .The results show that the sliding friction angle increases 3 °~5 ° when the moisture content of material is increased 10%.And the internal friction angle increase first and then decreased along with the increasing of moisture content ,and the power consumption of the screw conveyor increased 7~9 W under certain filling rate and rotational speed .%为了降低螺旋输送装置的输送功耗,提高输送效率,通过理论分析和试验研究,建立了不同输送条件下螺旋输送粗饲料功耗的数学模型,试验研究了螺旋转速及喂入量对输送装置的输送功耗和比能产量的影响。试验结果表明:转速每增加10r/min(喂入量为定值),输送装置的输送功耗增大5~9W,喂入量每增加0.1kg/s (转速为定值),输送功耗增大10~12 W;同时得知:输送含水率约24%的揉

  13. 带式输送机机头硐室改造及远距离卸载臂的研制%Reconstruction of Belt Conveyor Driving Head Chamber and Research & Development on Long-Distance Unloading Boom

    Institute of Scientific and Technical Information of China (English)

    王天平

    2012-01-01

    According to the belt conveyor hard to start due to the heavy load, the slipping of the conveying belt, temperature rising of the electric motor and other problems caused by the high conveying slope of the fully mechanized coal mining face and the unleveled designed gateway, based on the driving head structure of the belt conveyor as basis, the driving head chamber was designed for the belt conveyor and a new plan of the reconstruction was provided for the discharging unit of the driving head. Thus the inclined drop driving head cham- ber and the long distance discharging arm, with the reduction of the manufactured height of the installed platform in the driving head chamber of the belt conveyor, thus could reduce the slope of the buffer section in the large framework of the driving head of the belt con- veyor and the height of the large framework driving section could be reduced and the operation performances of the belt conveyor could not be affected. Meanwhile the application to the actual coal mining face had confirmed the applied value.%针对综采工作面运输坡度较大及巷道设计不平整等引发的带式输送机重载无法启动、输送带打滑、电机温度升高等问题,提出了以带式输送机机头结构为基准,设计带式输送机机头硐室并对机头卸载部进行改造的新方案,即倾斜落差式机头硐室和远距离卸载臂,通过降低带式输送机机头硐室安装平台的施工高度,从而降低带式输送机机头大架缓冲段的坡度,实现了大架传动部分降低高度安装而不影响带式输送机运行性能,同时通过实际工作面的应用验证了其实用价值。

  14. New Canonic Active RC Sinusoidal Oscillator Circuits Using Second-Generation Current Conveyors with Application as a Wide-Frequency Digitally Controlled Sinusoid Generator

    Directory of Open Access Journals (Sweden)

    Abhirup Lahiri

    2011-01-01

    Full Text Available This paper reports two new circuit topologies using second-generation current conveyors (CCIIs for realizing variable frequency sinusoidal oscillators with minimum passive components. The proposed topologies in this paper provide new realizations of resistance-controlled and capacitor-controlled variable frequency oscillators (VFOs using only four passive components. The first topology employs three CCIIs, while the second topology employs two CCIIs. The second topology provides an advantageous feature of frequency tuning through two grounded elements. Application of the proposed circuits as a wide-frequency range digitally controlled sinusoid generator is exhibited wherein the digital frequency control has been enabled by replacing both the capacitors by two identical variable binary capacitor banks tunable by means of the same binary code. SPICE simulations of the CMOS implementation of the oscillators using 0.35 μm TSMC CMOS technology parameters and bipolar implementation of the oscillators using process parameters for NR200N-2X (NPN and PR200N-2X (PNP of bipolar arrays ALA400-CBIC-R have validated their workability. One of the oscillators (with CMOS implementation is exemplified as a digitally controlled sinusoid generator with frequency generation from 25 kHz to 6.36 MHz, achieved by switching capacitors and with power consumption of 7 mW in the entire operating frequency range.

  15. 粒煤螺旋输送特性实验研究%Screw conveying characteristics of granular coal from screw conveyor

    Institute of Scientific and Technical Information of China (English)

    陈汝超; 陈晓平; 蔡佳莹; 刘道银; 梁财

    2012-01-01

    The screw conveying characteristics of granular coal from an screw conveyor was investigated.The results show that coal particle size,moisture content and conveying angle have significant effects on the screw conveying characteristics of granular coal.Screw velocity increases with the increasing of particle size of granular coal and decreases with the increasing of moisture content of granular coal.Increasing the conveying angle leads to serious sliding of the granular coal,and the filling coefficient increases.The filling coefficient increases with the increasing of particle size and moisture content of granular coal.%在自行设计的粒煤螺旋输送系统上对粒煤的螺旋输送特性进行了研究。结果表明:粒煤的粒径、外水分及螺旋倾角对其输送特性有显著影响。粒煤的平均粒径越大,外水分越小,其输送速率越大;螺旋倾角越大,输送过程中物料的滑移现象越严重,填充系数越大;粒煤的外水分越大,平均粒径越大,输送过程中的填充系数越大。

  16. The optimal design to the chain of pallet conveyors%平板输送机链条的优化设计

    Institute of Scientific and Technical Information of China (English)

    杨志斌

    2013-01-01

    The chain of ordinary pallet conveyor, consisted of roller sleeve chain with K-shaped accessory and steel squared pipe, moves at rolling and sliding between roller and the guide rail when load motion, so the power consumption is comparatively large. In this article was introduced the redesign of the roller structure, the needle roller bearing was equipped in the roller to change supporting motion into simple rolling motion, with the friction loading and main power consumption reduced.%普通平板输送机的链条,由带K型附件的滚子套筒链和方管钢组成,该链条在负载运行时,滚子和链条导轨之间是滚动兼滑动的摩擦运动形式,所消耗的动力功率较大。本文以该问题为切入点,重新设计了滚子结构,在滚子里面加装滚针轴承,使支撑运动形式变为了纯滚动,减小了运动中链条的摩擦负载,降低了主动功耗。

  17. Analysis on Oil Seal Leakage for Sprocket Assembly of Armored Face Conveyors%刮板输送机链轮轴组油封漏油分析

    Institute of Scientific and Technical Information of China (English)

    朱秀梅

    2014-01-01

    Armored face conveyor works in bad environment.Its floating oil seal installed in sprocket assembly is always failed and causes oil leakage,which may cause the lubricating oil waste and pollute the work environment,and even cause the damage of the bearing inside sprocket assembly.Various factors caused seal failure were analyzed from the quality of sprocket assembly floating oil seal,component installation,the habits of users and other aspects.It has a certain reference role to improve the seal reliability in sprocket assembly.%刮板输送机工作环境恶劣,其链轮轴组的浮动油封经常失效导致漏油,轻则造成润滑油浪费、工作环境被污染,重则导致链轮轴组内轴承损坏。从链轮轴组浮动油封自身质量、组件安装、用户使用等各环节对造成密封失效的各种因素进行分析,对提高链轮轴组密封可靠性有一定参考作用。

  18. Evaluation of variations in CO2 gas exchange in the atmosphere of the BTLSS with plants grown in a conveyor mode on the soil-like substrate

    Science.gov (United States)

    Velichko, Vladimir; Tikhomirov, Alexander A.; Tikhomirova, Natalia; Ushakova, Sofya

    2016-07-01

    The soil-like substrate (SLS) included in the bioregenerative life support system (BLSS) exerts a substantial effect on its gas exchange. This effect is determined by the non-uniform rate of organic matter degradation in the SLS, on the one hand, and by the variable intensity of photosynthesis of the plants grown on it, on the other. The purpose of this study was to compare CO2 variations in the atmosphere of the higher plants - SLS system at different intervals in uneven-aged higher plant conveyers. The study showed that CO2 concentration could reach and exceed the levels of atmospheric carbon dioxide acceptable for humans (over 1%) even when the conveyer interval was rather short. CO2 variations in the atmosphere of the higher plants - SLS system were determined not only by the frequency of adding plant waste to the SLS and the mass of the waste but also by the amount of the harvested actively photosynthesizing plant biomass. At the same time, no significant differences were found in the mineral and production components between the plants in different experiments. Results of the study can be used to optimize the conveyor interval and the associated effectiveness of mineralization of the plant waste added to the SLS and to stabilize the CO2 gas exchange. This study was carried out in the IBP SB RAS and supported by the grant of the Russian Science Foundation (Project No. 14-14-00599).

  19. Application research on virtual prototype technology in mine belt conveyor%虚拟样机技术在矿用带式输送机上的应用研究

    Institute of Scientific and Technical Information of China (English)

    程刚; 郭永存; 胡坤; 董祖伟

    2014-01-01

    将虚拟样机技术应用于矿用带式输送机的设计制造上可有效提高整机设计品质、缩短开发周期和降低开发成本。基于虚拟样机技术在机械产品研发中的技术优势与应用现状,列举了国外较为成熟的几款带式输送机专业化虚拟仿真软件,概述了国内学者借助第三方软件搭建带式输送机虚拟样机的方法策略,针对矿用带式输送机的刚-柔体结构特征,提出了建立矿用带式输送机虚拟样机多领域联合仿真的方法与设计框架,讨论了当前矿用带式输送机虚拟样机中关于输送带黏弹性体的准确建模、均匀与非均匀物料加载、柔性体输送带与刚性体零部件之间接触定义尚未妥善解决的三个关键技术问题,并给出相关解决建议与意见。%The application of virtual prototype technology in design and manufacture of the mine belt conveyor could effectively improve the whole conveyor′s design quality ,shorten development cycle and reduce development cost .Based on the technical advantages and application status of virtual prototype technology used in mechanical products research and development , this paper lists several simulation software of mature professional virtual belt conveyor abroad , summarizes the construction methods and strategies of belt conveyor′s virtual prototype through the third party software among the domestic scholars . In view of the firm-soft body structure characteristics of the mine belt conveyor , the multidisciplinary joint simulation method and design framework to establish virtual prototype on mine belt conveyor are proposed ,the three key technological issues without proper solutions yet are discussed in the current virtual prototype on mine belt conveyor :i.e .viscoelastic body′s accurate modeling of convey belt , homogeneous and heterogeneous material loading and definition of contact between flexible body conveyor belt and the rigid body components

  20. 切碎玉米秸秆螺旋输送性能试验研究%Performance Experiment of Screw Conveyor for Chopped Corn Stalks

    Institute of Scientific and Technical Information of China (English)

    赵圆圆; 王春光; 乌兰图雅; 王金莲

    2015-01-01

    This paper studied the single factor test and the orthogonal test of the screw conveyor performance of chopped corn stalks in the horizontal screw conveyor test device .The experiment studied the influence to the productivity and power consumption on the screw shaft speed , filling coefficient and pitch .The single factor test showed that the screw shaft speed , filling coefficient and pitch influenced the productivity and power consumption significantly ;and with the in-crease of screw shaft speed , the increase of filling coefficient and the increase of pitch , the productivity and power con-sumption are on the rise .The orthogonal test showed that these three factors impact on the productivity of the primary and secondary order is pitch , filling coefficient , screw shaft speed;these three factors impact on the power consumption of the primary and secondary order is screw shaft speed;pitch , filling coefficient .By the integrated balance method , the opti-mal level combination to maximize the productivity is A 1 B1 C3 , namely screw shaft speed 56 r/min, filling coefficient of 0.3, the pitch of 300 mm.This experiment can provide reference to improve the overall quality of the corn stalks spiral conveying .%在水平螺旋输送试验装置上对切碎玉米秸秆的螺旋输送性能进行了单因素试验和正交试验,研究了螺旋轴转速、填充系数和螺距对输送量和功率消耗的影响。单因素试验结果表明:螺旋轴转速、填充系数和螺距对输送量和功率消耗的影响显著;且随着螺旋轴转速、填充系数和螺距的增大,输送量和功率消耗都呈上升趋势。正交试验结果表明:因素对输送量影响的主次顺序是螺距、填充系数、转速;因素对功率消耗影响的主次顺序是转速、螺距、填充系数。采用综合平衡法最终得到的较优水平组合是 A1 B1 C3,即螺旋轴转速56 r/min、填充系数0.3、螺距300 mm。本试验可为提高玉米

  1. Solvent minimization induces preferential orientation and crystal clustering in serial micro-crystallography on micro-meshes, in situ plates and on a movable crystal conveyor belt

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Alexei S., E-mail: soares@bnl.gov [Brookhaven National Laboratory, Upton, NY 11973 (United States); Mullen, Jeffrey D. [Brookhaven National Laboratory, Upton, NY 11973 (United States); University of Oregon, Eugene, OR 97403-1274 (United States); Parekh, Ruchi M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Suffolk County Community College, Selden, NY 11784 (United States); McCarthy, Grace S.; Roessler, Christian G.; Jackimowicz, Rick; Skinner, John M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Orville, Allen M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Brookhaven National Laboratory, Upton, NY 11973 (United States); Allaire, Marc [Brookhaven National Laboratory, Upton, NY 11973 (United States); Sweet, Robert M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Brookhaven National Laboratory, Upton, NY 11973 (United States)

    2014-10-09

    Strategies are described for optimizing the signal-to-noise of diffraction data, and for combining data from multiple crystals. One challenge that must be overcome is the non-random orientation of crystals with respect to one another and with respect to the surface that supports them. X-ray diffraction data were obtained at the National Synchrotron Light Source from insulin and lysozyme crystals that were densely deposited on three types of surfaces suitable for serial micro-crystallography: MiTeGen MicroMeshes™, Greiner Bio-One Ltd in situ micro-plates, and a moving kapton crystal conveyor belt that is used to deliver crystals directly into the X-ray beam. 6° wedges of data were taken from ∼100 crystals mounted on each material, and these individual data sets were merged to form nine complete data sets (six from insulin crystals and three from lysozyme crystals). Insulin crystals have a parallelepiped habit with an extended flat face that preferentially aligned with the mounting surfaces, impacting the data collection strategy and the design of the serial crystallography apparatus. Lysozyme crystals had a cuboidal habit and showed no preferential orientation. Preferential orientation occluded regions of reciprocal space when the X-ray beam was incident normal to the data-collection medium surface, requiring a second pass of data collection with the apparatus inclined away from the orthogonal. In addition, crystals measuring less than 20 µm were observed to clump together into clusters of crystals. Clustering required that the X-ray beam be adjusted to match the crystal size to prevent overlapping diffraction patterns. No additional problems were encountered with the serial crystallography strategy of combining small randomly oriented wedges of data from a large number of specimens. High-quality data able to support a realistic molecular replacement solution were readily obtained from both crystal types using all three serial crystallography strategies.

  2. Solvent minimization induces preferential orientation and crystal clustering in serial micro-crystallography on micro-meshes, in situ plates and on a movable crystal conveyor belt.

    Science.gov (United States)

    Soares, Alexei S; Mullen, Jeffrey D; Parekh, Ruchi M; McCarthy, Grace S; Roessler, Christian G; Jackimowicz, Rick; Skinner, John M; Orville, Allen M; Allaire, Marc; Sweet, Robert M

    2014-11-01

    X-ray diffraction data were obtained at the National Synchrotron Light Source from insulin and lysozyme crystals that were densely deposited on three types of surfaces suitable for serial micro-crystallography: MiTeGen MicroMeshes™, Greiner Bio-One Ltd in situ micro-plates, and a moving kapton crystal conveyor belt that is used to deliver crystals directly into the X-ray beam. 6° wedges of data were taken from ∼100 crystals mounted on each material, and these individual data sets were merged to form nine complete data sets (six from insulin crystals and three from lysozyme crystals). Insulin crystals have a parallelepiped habit with an extended flat face that preferentially aligned with the mounting surfaces, impacting the data collection strategy and the design of the serial crystallography apparatus. Lysozyme crystals had a cuboidal habit and showed no preferential orientation. Preferential orientation occluded regions of reciprocal space when the X-ray beam was incident normal to the data-collection medium surface, requiring a second pass of data collection with the apparatus inclined away from the orthogonal. In addition, crystals measuring less than 20 µm were observed to clump together into clusters of crystals. Clustering required that the X-ray beam be adjusted to match the crystal size to prevent overlapping diffraction patterns. No additional problems were encountered with the serial crystallography strategy of combining small randomly oriented wedges of data from a large number of specimens. High-quality data able to support a realistic molecular replacement solution were readily obtained from both crystal types using all three serial crystallography strategies.

  3. 不同载荷下的可伸缩带式输送机动态特性分析%Dynamic Performance Analysis of Extensible Belt Conveyor under Different Loads

    Institute of Scientific and Technical Information of China (English)

    苏永红

    2016-01-01

    The model of an extensible belt conveyor was set up by AMESim ,the processes of start ,full‐speed moving and the tail moving of belt conveyor under different load were simulated .The simulation shows that in the starting of the belt conveyor ,the load has significant effect on driving drum tension ,the lag of tail speed and the peak velocity of take‐up;In the process of tensioning force change ,the greater the load ,the greater the tension fluctuation at driving drum ;In the process of the tail moving ,the greater the load ,the slower the speed of tension wave spread to the driving drum ,the faster the attenuation of tension fluctuation at driving drum and the take‐up speed fluctuation .%建立了可伸缩带式输送机AMESim模型,对输送机在不同载荷下启动、满速运行和机尾自移等过程进行了仿真。仿真结果表明,带式输送机启动过程中,载荷量对驱动滚筒趋入点张力、机尾速度响应时间和游动小车速度峰值等均有明显影响;拉紧力变化过程中,载荷量越大,驱动滚筒趋入点张力波动越大;机尾自移时,载荷量越大,应力波传到机头的速度越慢,驱动滚筒趋入点张力波动和游动小车速度波动衰减越快。

  4. Detection system design of powerful conveyor belt based on the X-ray%基于X射线的强力运送带检测系统设计

    Institute of Scientific and Technical Information of China (English)

    谭成; 薛彦波; 胡宗亮

    2016-01-01

    In view of the existing strength conveyor belt fault line detection and location is difficult and waste a long time,the design of a conveyor belt automatic detection system handle the joint tensile,corrosion,fracture and other issues.Based on the video image acqui⁃sition principle and defect detection algorithm,it design the overall scheme of the system,combined with hardware and software develop⁃ment,the conveyor belt online detection,real⁃time,rapidly visual detection,for steel wire rope core conveyer belt running status,fault di⁃agnosis and decision make a reliable judgement way.%针对现有的强力运送带故障在线检测定位难、周期长情况,设计一套输送带自动检测系统来处理接头拉伸、锈蚀、断裂等故障问题。依据视频图像采集原理及缺陷检测技术算法,设计系统总体方案,结合硬件和软件开发,实现了运送带在线检测、实时性、快速性的可视化检测,为钢丝绳芯运送带运行状况、故障诊断与决策得出可靠判断方式。

  5. Application of plasma cladding technology to reparation of middle pan of scraper conveyor%等离子熔覆修复技术在中部槽维修中的应用

    Institute of Scientific and Technical Information of China (English)

    张永强; 马忠昌; 李鹏

    2014-01-01

    从刮板输送机中部槽的结构原理和材料入手,分析了刮板输送机中部槽失效的原因,详细阐述了等离子熔覆修复技术在刮板输送机中部槽磨损中板修复中的应用。通过井下工业性对比试验证明,采用等离子熔覆修复技术修复的刮板输送机中部槽不仅能够提升维修品质、延长使用寿命和降低设备的维修频次,而且能够减少人力和维修材料等系统性的浪费。%From the structure principle and the used material of middle pan of scraper conG veyor for fully mechanized mining,the failure reasons of middle pan of scraper conveyor were anG alyzed and the application of plasma cladding technology to reparation of wornGout middle plate in middle pan of scraper conveyor was described in detail�The contrast underground industrial tests showed that the middle pan of scraper conveyor repaired by plasma cladding technology are of good maintenance quality,increased service life and decreased maintenance frequency,as well as less wastes of manpower and maintenance materials.

  6. Avaliação técnica de um transportador pneumático de grãos por aspiração Technical evaluation of a suction pneumatic grain conveyor

    Directory of Open Access Journals (Sweden)

    Luís Antônio Bortolaia

    2008-04-01

    Full Text Available Este trabalho apresenta os resultados da avaliação técnica do protótipo do transportador pneumático de grãos por aspiração ASP 200. O equipamento foi construído para uso em instalações armazenadoras agrícolas, na limpeza de pés de elevadores, moegas e renovação do ar em galerias de silos. Os testes avaliaram características mecânicas do equipamento, descargas de material e ar, perdas de carga, vedação do equipamento, eficiência dos captores e o diâmetro das mangueiras. Os resultados subsidiaram diversas recomendações para melhoria no projeto do equipamento, que aumentarão a sua eficiência operacional. Embora o transporte pneumático seja considerado uma ciência experimental, os autores notaram a falta de procedimentos, parâmetros e orientações para testes e comparações na literatura, que são fundamentais para o desenvolvimento do projeto desses transportadores.This research shows the results that were obtained from technical evaluation of ASP 200 prototype that is a suction pneumatic grain conveyor. This equipment was built to use in agricultural storage facilities to clean bucket elevator feet, loading hoppers and air renovation in silo galleries. The tests have evaluated mechanical characteristics of conveyor, air and material discharges, pressure losses, air infiltration, intake nozzle efficiency and piping diameters. The results have allowed several recommendations to improve equipment design that will increase its operational efficiency. Although pneumatic conveying is considered an experimental science, the authors have perceived the lack of procedures, parameters and orientations to conduct tests and comparisons in literature, that are fundamental to develop a design of this conveyor type.

  7. DISCUSSION ON PROBLEMS IN DOUBLE-LAYER BELT CONVEYOR AND RESOLUTIONS%双层皮带机存在问题及解决措施的探讨

    Institute of Scientific and Technical Information of China (English)

    谭仕梅; 张云斌

    2012-01-01

    The causes are analyzed for the problem exposed during the operation of a double-layer belt conveyor for finish product in fertilizer plant and optimized actual operation effect after the transformation evaluated. measures for improvement are introduced and the%针对化肥成品装置双层皮带机在生产中暴露出来的问题,分析存在的原因,介绍优化改进措施,对改造后的实际运行效果进行评价。

  8. Conveyor Belt Surface Image Correction and Fault Detection Algorithm Research Based on Machine Vision%基于机器视觉的输送带图像校正和故障检测算法研究

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    为了消除基于机器视觉的输送带故障在线监测系统中采集图像的不均匀光照影响,提高图像质量,检测出图像中的故障区域,提出了一种基于机器视觉的输送带图像校正和故障检测算法.该算法首先采用Butterworth低通滤波器对图像滤波,结合Retinex理论计算估计真实图像的背景,对图像进行灰度校正,得到校正后的图像;然后将机器视觉与生物视觉相结合,利用PCNN算法,对采集的图像进行检测,检测出故障区域.实验结果表明,算法能有效校正输送带表面图像,清晰检测出故障区域,具有很高的应用价值.%For the purposes of eliminating the influence of the non-uniform illumination which was used in on-line fault moni-toring system of conveyor belt based on machine vision and improved the quality of detected image and detecting the fault area of the image, a new kind of detection algorithm based on machine vision was proposed which can be used to realize the image correc-tion and fault detection of conveyor belt. The proposed algorithm firstly implemented the low-pass filtering of the acquired images by using Butterworth low-pass filter, then established estimated background model of the non-uniform illumination based on Retinex theory. Gray scale of the image can be amended evenly. Lastly, by using the combination the machine vision with biological vision and PNCC theory, the defected area of collected surface image of the conveyor belt was detected. Experimental results show that the proposed algorithm can be effectively used to correct the uneven gray scale of the surface images and detect the defected area of the surface image. It proves that this proposed algorithm has very high application value in mine belt conveyor supervision system.

  9. The Application ofMaterial Handling System ofBeltConveyor Controlled by Mitsubishi PLC%三菱PLC控制带式输送机物料输送系统的应用

    Institute of Scientific and Technical Information of China (English)

    李欢良

    2016-01-01

    带式输送机在江铜各大厂矿得到广泛应用,它的控制形式有继电接触器、单片机、微机和PLC控制等多种形式。根据江铜输送矿石的实际需求和应用,提出多级带式输送机集中控制系统设计方案。根据带式输送机的工作流程和控制要求,利用三菱FX2N系列PLC的集中控制和简单可视化的程序开发设计带式输送机物料输送控制系统。根据设计条件、控制要求,分析输入输出地址,设计了电路图、接线图和梯形图,对PLC进行了选型、程序的编制,并对程序进行模拟仿真,确保程序的可运行性。%With the development of modern industrial technology, the applicationof belt conveyor hasbecome increasingly widespreadin Jiangxi Copper with diversified forms of relay contactor, single-chip microcomputer, microcomputer and PLC control. This paper puts forward the centralized control system design of multi-stage belt conveyor on the basis of the practical needs and application. It introducesthe application of PLC to the electric control system of the belt conveyor. According to the requirements for production control of the belt conveyor, we develops the control systembased on the centralized control and simple visualization of the Mitsubishi FX2N PLC. We analyze the input and output address analysis, design the circuit diagram, wiring diagram and ladder diagram, select the PLC model and program it based on the design condition and control requirement, and simulate the program to ensure its performability.

  10. Cause analysis of and measures against frequent belt conveyor high-voltage motor faults%带式输送机高压电动机故障频发的原因分析及对策

    Institute of Scientific and Technical Information of China (English)

    薛永杰

    2011-01-01

    The paper carries out field studies specific to the frequent phenomenon that the high-voltage motor is burned in the belt conveyor system, and finds out the root causes that led to the accidents. thereby effectively prevent the impact on the production imposed hy the motor fault.%针对带式输送机系统频繁出现的高压电动机烧毁现象进行现场研究,找出了事故发生的根源,从而有效避免了电动机故障对生产的影响.

  11. 长距离、大功率带式输送机驱动方式分析%Analysis on drive modes of long-distance high-power belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈建松; 周伟朵

    2012-01-01

    通过对长距离、大功率带式输送机3种驱动方式的技术经济比较,得出高压变频器驱动方式不仅在带式输送机起动方面有优良的性能,在运行方面也能满足输送机频繁重载起制动、频繁切换工况、小流量输料等生产特点,而且高效节能.%By technical economical comparison of three drive modes of long-distance high-power belt conveyors, this paper proves that the drive mode of high voltage frequency converter has excellent performance in start-up of the belt conveyor, and for the operation aspect it can meet requirements of frequent heavy-loaded start-up and braking, and frequent switching conditions, as well as small flow material conveying. In addition, the mentioned drive mode has high efficient and energy-saving properties.

  12. The design and calculation of screw conveyor and its application in pulp and paper industry%螺旋输送器的设计计算及其在制浆造纸工业的应用

    Institute of Scientific and Technical Information of China (English)

    邵贤林; 王平

    2013-01-01

    Screw conveyor is an important material transporting equipment in pulp and paper industry. In this article was introduced the conveying mechanism of the horizontal or inclined and vertical screw conveyors and the determination of the main parameters firstly, then their application in pulp and paper industry. Through experiment, the data of the materials commonly used in pulping, such as the loose density were worked out.%螺旋输送器是制浆造纸工业中物料输送的重要设备。本文首先讨论了水平(或倾斜式)与立式螺旋输送器的输送机理和主要参数的确定,然后讨论了在制浆造纸工业的应用,并通过实验给出了常用制浆材料的松密度等数据。

  13. 皮带输送机在大型散装硫磺转运系统的应用%APPLICATION OF CONVEYOR IN LARGESCALE BULK SULFUR TRANSFER SYSTEM

    Institute of Scientific and Technical Information of China (English)

    焦玉清

    2013-01-01

    分析了普光天然气净化厂皮带输送机,在大型散装硫磺转运系统中存在的硫磺着火和粉尘爆炸、硫磺腐蚀、皮带跑偏等技术难题,针对这些难题,优选皮带输送机的关键部件,设计可靠的运行控制系统,采用多项安全防护技术,实现了普光气田天然气净化厂散装硫磺转运系统的安全、平稳、长周期运行.%This paper analyzes the technical problems of belt conveyor in large bulk sulfur transfer system which include sulfur burning, dust explosion,sulfur corrosion,run offset and so on. Aiming at these problems, the key parts of the belt conveyor are optimized; reliable operation control system is designed and multiple security protection technologies are adopted, which help to realize the safe, stable and long period operation of the bulk sulfur transfer system in Natural Gas Purification Plant of Puguang Gas Field.

  14. 螺旋钻采煤机输送机构振动频率的计算与分析%Calculation and analysis of vibration frequency of spiral conveyor for coal auger

    Institute of Scientific and Technical Information of China (English)

    李晓豁; 郭继文; 王丽; 战林

    2011-01-01

    In order to study the vibration behavior of spiral conveyor of a coal auger during the work process, a dynamic model using Euler angles to describe the vibration according to Lyapunov theory was established, and ANSYS software was used to establish parameterization finite element simulation model based on APDL language. The vibration of a certain type of spiral conveyor for coal auger were calculated and simulated using the two methods, and the first fifth-order vibration frequency and maximum amplitude equivalent contour of spiral conveyor were obtained. The results of vibration analysis by ANSYS show that transverse resonance occurred in the X and Z directions, the maximum resonance amplitude occurred in the 500 Hz and 100 Hz, longitudinal resonance occurred in the Y direction, the maximum resonance amplitude occurred in the 500 Hz, and the amplitude of X direction is the largest and amplitude of Z direction is the minimum. The stress contour shows that the stress of spiral conveyor is minimum at the bottom, and the stress at the junction of spindle and helical vane is maximum. Because of the large stress at the top of spiral conveyor, the wear and deformation is serious. The results indicate that the Lyapunov theory model is straight forward and the calculation is simple; the ANSYS model is flexibility and the results are intuitively obvious although the accuracy is dependent on the selection of element type, meshing accuracy and the methods of vibration extraction. The maximum error obtained from both methods is 9. 9% , capable of reflecting the true vibration.%为了研究螺旋钻采煤机输送机构工作过程的振动,根据Lyapunov理论建立了用欧拉角描述的振动动力学方程,应用ANSYS软件建立了基于APDL语言的参数化有限元仿真模型,利用两种方法对某型螺旋钻采煤机输送机构的振动频率进行了计算和仿真,得到了输送机构前五阶的振动频率和最大振幅等效云图.其中通过ANSYS振动

  15. Mining-induced fault reactivation associated with the main conveyor belt roadway and safety of the Barapukuria Coal Mine in Bangladesh: Constraints from BEM simulations

    Energy Technology Data Exchange (ETDEWEB)

    Islam, Md. Rafiqul; Shinjo, Ryuichi [Department of Physics and Earth Sciences, University of the Ryukyus, Okinawa, 903-0213 (Japan)

    2009-09-01

    Fault reactivation during underground mining is a critical problem in coal mines worldwide. This paper investigates the mining-induced reactivation of faults associated with the main conveyor belt roadway (CBR) of the Barapukuria Coal Mine in Bangladesh. The stress characteristics and deformation around the faults were investigated by boundary element method (BEM) numerical modeling. The model consists of a simple geometry with two faults (Fb and Fb1) near the CBR and the surrounding rock strata. A Mohr-Coulomb failure criterion with bulk rock properties is applied to analyze the stability and safety around the fault zones, as well as for the entire mining operation. The simulation results illustrate that the mining-induced redistribution of stresses causes significant deformation within and around the two faults. The horizontal and vertical stresses influence the faults, and higher stresses are concentrated near the ends of the two faults. Higher vertical tensional stress is prominent at the upper end of fault Fb. High deviatoric stress values that concentrated at the ends of faults Fb and Fb1 indicate the tendency towards block failure around the fault zones. The deviatoric stress patterns imply that the reinforcement strength to support the roof of the roadway should be greater than 55 MPa along the fault core zone, and should be more than 20 MPa adjacent to the damage zone of the fault. Failure trajectories that extend towards the roof and left side of fault Fb indicate that mining-induced reactivation of faults is not sufficient to generate water inflow into the mine. However, if movement of strata occurs along the fault planes due to regional earthquakes, and if the faults intersect the overlying Lower Dupi Tila aquiclude, then liquefaction could occur along the fault zones and enhance water inflow into the mine. The study also reveals that the hydraulic gradient and the general direction of groundwater flow are almost at right angles with the trends of

  16. Regenerative treatment using a radioelectric asymmetric conveyor as a novel tool in antiaging medicine: an in vitro beta-galactosidase study

    Directory of Open Access Journals (Sweden)

    Rinaldi S

    2012-06-01

    Full Text Available Salvatore Rinaldi,1,2 Margherita Maioli,1,3,4 Sara Santaniello,3,4 Alessandro Castagna,1,2 Gianfranco Pigliaru,3,4 Sara Gualini,3,4 Matteo Lotti Margotti,5 Arturo Carta,6 Vania Fontani,1,2 Carlo Ventura1,4,71Department of Regenerative Medicine, Rinaldi Fontani Institute, Florence; 2Department of Neuro Psycho Physio Pathology and Neuro Psycho Physical Optimization, Rinaldi Fontani Institute, Florence; 3Department of Biomedical Sciences, University of Sassari, Sassari; 4Laboratory of Molecular Biology and Stem Cell Engineering, National Institute of Biostructures and Biosystems, Bologna; 5Department of Information Technology and Statistical Analysis, Rinaldi Fontani Institute, Florence; 6Ophthalmology Section, University of Parma, Parma; 7Cardiovascular Department, S Orsola Malpighi Hospital, University of Bologna, Bologna, ItalyBackground: Beta-galactosidase is the most widely used biomarker for highlighting the processes of cellular aging, including neurodegeneration. On this basis, we decided to test in vitro whether a set of rescuing/reparative events previously observed by us in subjects treated with radioelectric asymmetric conveyor (REAC technology may also involve antagonism of a marker of aging-related degenerative processes, as assessed by a reduction in beta-galactosidase at the cellular level.Methods: Human adipose-derived stem cells were cultured at different passages, ranging from 5 to 20, with or without REAC exposure for 12 hours. The cells were then processed for biochemical beta-galactosidase staining and morphological microscopy analysis.Results: We observed a significant reduction in expression of senescence associated-beta-galactosidase, and a persistence of fibroblast-like morphology typical of human adipose-derived stem cells, even at late passages.Conclusion: Our results indicate the ability of REAC technology to counteract in vitro senescence of human adipose-derived stem cells, and prompt the hypothesis that such

  17. 除冰车铲冰装置传送带的分析与研究%Analysis and Research of Deicing Special Vehicle Shovel Ice Device Conveyor

    Institute of Scientific and Technical Information of China (English)

    张志富; 黄其柏; 陈定方; 王晓娟

    2015-01-01

    In view of the phenomenon that icy roads to road traffic accidents have severely affected,a mechanical deicing special vehicle for road deicing,which carried on the reasonable design and layout is devised.The belt drive system of mechanical deicing device is major researched,infinitesimal dynamics equation of conveyor belt is established,and the belt drive system is analyzed in theory.Through theory design and engineering design algorithm,the belt transmission torque and power is analyzed,the foundation for the further study of belt transmission is laid.By using the ANSYS and ADAMS,the stress simulation and dynamics simulation of belt drive systems are carried out,and the correctness of the preliminary design of pulley drive system is validated,the technical support of the optimum design of deicing special vehicle is provided.The study of deicing special vehicle deicing efficiency has played a key role,which with better economic benefits and promotional value.%针对路面结冰对道路交通安全事故存在严重影响的现象,设计出了一款用于道路除冰的机械式除冰专用车,对其进行合理的设计与布局;主要研究机械铲冰装置的带传动系统,建立传送带的微元动力学方程,对带传动系统进行了理论分析;通过理论设计和工程设计算法对带传动的转矩和功率进行分析,为带传动进一步的研究奠定了基础;通过ANSYS和ADAMS对带传动系统分别进行应力仿真和动力学仿真,验证了初步设计的带轮传动系统的正确性,为除冰车的优化设计提供了技术支撑,对除冰车除冰效率的研究起到了关键的作用,具有较好的经济效益和推广价值.

  18. Análisis y solución de avería del acoplamiento del sinfín de fondo de la Bañera de una Planta de Plástico Mixto. // Analysis and solution of the coupling failure of the bottom worm conveyor of the bathtub in a Mixed Plastic Plant.

    Directory of Open Access Journals (Sweden)

    R. Goytisolo Espinosa

    2004-09-01

    Full Text Available En el trabajo se realizó una investigación para esclarecer las causas de la avería del acoplamiento del sinfín de fondo de labañera de una planta de plástico mixto. En la misma se concluyó que las causas fundamentales de las obstrucciones delsinfín de fondo son el hecho de que el sinfín de elevación de la bañera tiene una capacidad cuatro veces menor que el sinfínde fondo, lo que provoca que el material se acumule en el fondo de la bañera y por otro lado la comunicación entre el sinfínde fondo y el de elevación se produce a través de un tubo vertical de capacidad reducida, que constituye también un cuellode botella. Se modificó la relación de transmisión de la cadena del accionamiento del sinfín de elevación para elevar suvelocidad e igualar la capacidad de transportación de ambos sinfines y se eliminó el tubo de conexión entre los mismos. Elacoplamiento se fabricó de plástico poliamídico, lográndose una adecuada resistencia.Palabras claves: Bañera de plástico, transportadores sinfín, acoplamiento dentado.___________________________________________________________________________Abstract.In this paper is shown the investigation carried out in order to clarify the failure causes of the coupling of the bottom wormconveyor of the bathtub in a Mixed Plastic Plant. In the same was it was concluded that the fundamental causes of theobstructions of the bottom conveyor are the fact that the elevator worm conveyor of the bathtub has a capacity four timesminor that the bottom conveyor, which causes that the material accumulates in the bottom of the bathtub, and on the otherhand the communication between the bottom conveyor and the elevator one takes place through a vertical tube of reducedcapacity that also constitutes a bottle neck. The transmission relationship of the chain of the elevator working conveyor wasmodified in order to elevate their speed and to equal the capacity of transportation of both conveyors, and the

  19. Finite Element Analysis of Screw Conveyor of Horizontal Screw Centrifuge with Large Aspect Ratio%大长径比卧螺离心机螺旋输送器的有限元分析

    Institute of Scientific and Technical Information of China (English)

    杨钊; 黄维菊; 高志惠; 陈文梅

    2011-01-01

    应用SolidWorks对大长径比卧螺离心机的转鼓-螺旋输送器系进行了三维建模,采用与SolidWorks无缝衔接的有限元分析插件Simulation对其进行了有限元仿真。通过SolidWorks Simulation对螺旋输送器在正常工况下的整体结构进行了静力分析和模态分析,得到了螺旋输送器前5阶固有频率、应力分布和径向、轴向变形。研究了导程、转速和叶片厚度等主要参数的变化对螺旋输送器应力和变形的影响,以实现对离心机的优化。通过对大长径比卧螺离心机和普通卧螺离心机转鼓-螺旋输送器系的比较,在保证强度、刚度要求和相同生产能力的条件下,大长径比卧螺离心机具有更强的分离能力,螺旋输送器具有更好的应力和变形分布,并且临界转速也得到了提高。%The drum and screw conveyor of Horizontal Screw Centrifuge with Large Aspect Ratio are modeled by SolidWorks.FEA simulation was conducted by a finite element analysis software-Simulation embedded in SolidWorks,Mode and static monolithic structure of the screw conveyor under the normal working state was analysed.The 5 rank frequencies,stress distribution,the radial and axial deformation were obtained.Through changing parameters such as the lead 、the half cone angle rotational speed and the blade thickness,the paper investigates the impact of parameters on the strength,displacement and vibration form,in order to realize the optimization of centrifuge.The comparison between the common drum with the Large Aspect Ratio one was implemented,the paper finds that the former has a better separation capacity,better stress and deformation distribution of screw conveyor and the rotors has higher critical speed.

  20. 输送机非线性动力学的研究及其对动态性能的影响%Study on conveyor non-linear dynamics and its effect on dynamic behavior

    Institute of Scientific and Technical Information of China (English)

    李光布

    2004-01-01

    A conveyor linear system assumption is based on an approximate description of belt mechanics behavior and constant elastic module. It produces analysis errors and improper dynamics simulation in large conveyors. The belt non-linear characteristics based on sag are described and the belt equivalent elastic module expression is deduced. The relationship between belt-equivalent elastic module and elastic module is studied, and their ratio varies from 0. 1 to 1. 0. The non-linear motion equation with a lumped element model is put forward. Its increment equation and numerical solution are built. A dynamics simulation on a conveyor is carried out, mainly to calculate and compare belt speed, acceleration, tension, displacement of gravity take-up and wave period with linear and non-linear models. It shows that the simulation errors between two models vary from 6% to 50%.%输送机线性系统的假设是在胶带力学特性和弹性模量不变的情况下近似提出的. 这种假设会使大型输送机产生理论误差和不正确的动力学仿真结果. 本文分析了基于胶带悬垂度的非线性特性, 推导了等效弹性模量的表达式, 研究了胶带等效弹性模量和弹性模量之间的关系, 并发现两者的比值在0. 1~1. 0之间变化. 提出了输送机有限单元模型的非线性运动方程及其增量方程和数值解法. 通过对一输送机动态特性的仿真分析, 发现用线性和非线性2种模型, 它们动态参数(如带速, 胶带加速度, 张力以及重锤位移和张力波速)的计算误差介于6%~50% 之间.

  1. Vibration test and fault diagnosis of belt conveyor drive unit%带式输送机驱动装置振动测试与故障诊断

    Institute of Scientific and Technical Information of China (English)

    盛延忠

    2011-01-01

    结合西基港务分公司带式输送机驱动装置振动监测与分析实践,阐述了振动频谱分析技术在减速器中的应用,分析诊断结果与实际情况高度一致,可为同类设备预测维修实践提供参考.%Combining the vibration monitoring and analysis of the belt conveyor drive unit in Guangzhou Port Group Co. , Ltd. Xiji Stevedoring Branch Company, the paper describes the application of vibration spectrum analysis technology,and the analysis and diagnosis results is highly in consistent with the actual situation, providing reference for the predictive maintenance practices of similar equipment.

  2. Application of Control System for “green”rail roller conveyor%“绿色”钢轨辊道输送机控制系统的应用

    Institute of Scientific and Technical Information of China (English)

    郭鲁宁; 郭晋龙; 蔡庄厚; 赵子龙

    2011-01-01

    The Control System of "green"rail roller conveyor was with advanced facilities, well-planned layout, high level of mechanization, finished structure, little floor area, high production efficiency. It was up to the national environmental standards for modernized rails welding production line.%“绿色”钢轨辊道输送机系统设施先进,布局合理,机械化程度高,具有结构精巧,占地面积少,节电能力强,生产效率高的特点,符合国家环保标准的现代化焊轨生产线要求.

  3. 输送机内、外链板冲孔模具的设计与工艺优化%Designing & Process Optimization of the Punching Mould of Inner/Outer Scraping Blade on Conveyor

    Institute of Scientific and Technical Information of China (English)

    林广学; 闫秀梅

    2011-01-01

    In order to increase the Machining accuracy and efficiency of the inner/outer scraping blade on conveyor, one new designed punching mould was introduced in this paper. It improved the accuracy and efficiency of punching the inner hole of the scraping blade, insured the product quality.%为了提高输送机内、外链板孔的加工精度及加工效率,该文设计了一套新型链板冲孔模具,可以准确、高效地加工输送机链板内孔,确保了产品质量。

  4. Analysis on the Use of Differential Mechanism in the Double Driving System of Large Belt Conveyor%浅析差速器在大型带式输送机双驱动系统中的应用

    Institute of Scientific and Technical Information of China (English)

    刘芳忠; 陈国敏; 刘永钰

    2013-01-01

    This paper described the load distribution principle of double driving belt conveyor,and pointed out the shortcomings and deficiencies of the double driving system currently used.Based on the characteristics of double driving of belt conveyor,we put forward a new type of double driving which uses differential mechanism to distribute the loads,and introduced how it works. In this paper,the model of the new type double driving system was established,and the dynamic simulation was done.The results proved that the drive system can make the loads distributed ideally between the two drums and the two motors.%简要阐述了双驱动胶带输送机负载分配的原理,指出了当前使用的双驱动方式存在的缺点和不足。基于双驱动带式输送机的传动特点,本文提出一种新型的,使用差速器对动力进行分配的带式输送机双驱动方式,介绍了差速器以及该新型双驱动系统的工作原理,并在 ADAMS 中建立了该驱动系统模型,进行了动力学仿真,分析了仿真结果,证明该驱动系统可以在双滚筒及双电机之间进行理想的动力分配。

  5. 一种基于第二代电流传输器的积分器设计%Design of an integrator based on second generation current conveyors

    Institute of Scientific and Technical Information of China (English)

    邓盼盼

    2012-01-01

    介绍了一种基于低压、宽带、轨对轨、自偏置CMOS第二代电流传输器(CCⅡ)的电流模式积分器电路,能广泛应用于无线通讯、射频等高频模拟电路中。通过采用0.18μm工艺参数,进行Hspice仿真,结果表明:电流传输器电压跟随的线性范围为-1.04~1.15V,电流跟随的线性范围为-9.02~6.66mA,iX/iZ的-3dB带宽为1.6GHz。输出信号的幅度以20dB/decade的斜率下降,相位在低于3MHz的频段上保持在90°。%An integrator based on low-vohage,wideband, rail-to-rail and self-biased CMOS second generation current conveyor (CCⅡ) is proposed,which is widely used in wireless communications, RF and other high-frequency analog circuits. Using 0.18urn CMOS process parameters, the Hspice simulation showed that the following voltage of the current conveyor varies linearly from -1.04V to 1.15V, and the linear range of the following current is -9.02mA-6.66mA. The iX/iZ has -3dB bandwidth of 1.6GHz. The output amplitude decreases on the slope of 20dB/decade, and the phase remains 90 degree when the frequency is below 3 MHz.

  6. 刮板输送机中部槽关键部件磨损形貌及影响因素分析%Analysis of Wear Appearance and Influence Factors of Middle Chute Critical Components in Scraper Conveyor

    Institute of Scientific and Technical Information of China (English)

    史志远

    2016-01-01

    To the large amount troubles that caused by middle chute wear in scraper conveyor, and some coherent company of scraper conveyor was invested, which included typical coal mine, manufacturing enterprise, filed service and detection center and so on. Based on modern tribology, interaction principle and fatigue damage theory, with structural composition of middle chute and serv-ice condition, then the material of wear chute samples were studied. And the basic wear appearance of middle chute was put forward, and the important influence factors that caused middle chute wear appearance were analyzed form different service condition.%针对刮板输送机中部槽磨损严重造成故障多发的情况,调研了典型煤矿用户、生产企业、维修现场及检测检验中心等刮板输送机相关单位,根据现代摩擦学理论、交互作用原理及疲劳损伤理论,结合中部槽结构组成及使用工况,对调研获得的磨损样槽资料进行了研究,总结出了中部槽的基本磨损形貌,并从不同类型的工况环境中分析出了形成中部槽磨损状态的重要影响因素。

  7. Research on Starting Techniques of High Power Multi-drive Belt Conveyor with Load-limiting Fluid Coupling%大功率多驱动限矩型液耦带式输送机起动技术研究

    Institute of Scientific and Technical Information of China (English)

    黄小军; 刘洪宝; 乔朝起

    2015-01-01

    Long-distance high power belt conveyor has been widely applied in the handling system of bulk cargo terminal. Most drive units of the belt conveyors are characterized with high power, multi-drive and load-limiting type of fluid coupling. With the development of high power multi-drive system, to ensure the stable starting of multi-drive belt conveyor and decrease its impact on the electric power network as much as possible, it’s necessary to program the starting sequence and time interval of motors. In the starting process, the electrical and mechanical setting and cooperation have been carried out to start the multi-drive belt conveyor stably and reliably.%长距离大能力带式输送机在散货港口系统中得到普遍应用,其驱动装置多采用大功率、多驱动、限矩型液耦的配置形式;随着大功率、多级驱动应用的增多,为保证多台电机驱动下皮带输送机能够平稳起动,并尽可能避免起动对电网冲击,合理规划各个驱动的起动顺序及间隔很有必要。本文阐述了多级驱动起动过程中机械、电气的设置和配合,从而实现多级驱动下稳定可靠安全地起动带式输送机。

  8. GCD无齿轮传动在超大型主斜井带式输送机设计中的运用%Application of GCD gearless driving in the design of belt conveyor for very large main inclined draft

    Institute of Scientific and Technical Information of China (English)

    谢永刚

    2014-01-01

    阐述了中煤大海则煤矿主井带式输送机前期驱动系统方案的设计及选用论证,介绍了国外用于特大功率带式输送机驱动系统的传动方式———GCD无齿轮传动系统,该传动方式的设计理念将给传统带式输送机的传动方式的设计理念和思路给予一定启示。%The earlier design and selection of driving system for belt conveyor used in main draft of Dahaize Coal Mine of China National Coal Group Corporation were expounded�� GCD gearless driving system,used for ultrahigh power belt conveyor in abroad,was introduced��This kind of driving mode will bring a certain inspiration for the driving design of conventional belt conveyor.

  9. 不停机调节带式输送机托辊偏置角的方法%Method for Adjusting Bias Angle of Rollers when Belt Conveyor Running

    Institute of Scientific and Technical Information of China (English)

    王海斌; 李允旺; 白森; 贾正乾; 陈井刚

    2015-01-01

    Adjusting the bias angle of the roller of the belt conveyor is a common method to adjust the belt deviation. The paper introduces two method for adjusting the bias angle of the rollers when the belt conveyor running. The first method is using a longer shaft roller, the end of the extension shaft is lengthened. There is a longer part of the shaft outside the roller supporting, after the roller is installed on the supporting roller. The outer end of the roller shaft can be lifted and moved to other shaft slot, by hand and using other tools. The second method is using a roller frame which can adjusting the bias angle of the rollers. Second, adopt the bracket which has adjustable offset angle of the roller frame, and the roller frame outer end is provided with a slide deck which can regulate the position through screw, supporting roller shaft end clamping on the slider deck. By turning the screw to regulate the slide deck’s position, to realize the regulating of the supporting roller’s offset angle. That two methods are applied in the belt conveyor of Shanxi Lexus of Coal Industry Co. Ltd. and it is highly effective, safety, and offset regulating effect good when the supporting roller’s offset angle is adjusted.%调节托辊的偏置角是对带式输送机输送带调偏的一个常见方法,介绍了2种不停机调节托辊斜置角的方法。①使用轴端加长的托辊;该托辊一端的伸出轴被加长,安装在托辊架上后,托辊支撑座的外侧伸出一段较长的轴段。可徒手或借用工具将托辊外端抬起,并移至其他卡槽内;②采用可调托辊偏置角的托辊架,该托辊架外端设有可通过螺杆调节位置的滑块卡座,托辊轴的外端头卡装在滑块卡座上。通过转动螺杆调节滑块卡座位置,实现托辊偏置角的调节。这2种方法在山西凌志达煤业有限公司的多部带式输送机上得以应用,调整托辊偏置角时高效、安全,调偏效果良好。

  10. Flow field simulation and structure optimization of confined hood at transshipment point of coal conveyor belt%输煤皮带转载点密闭罩流场模拟与结构优化

    Institute of Scientific and Technical Information of China (English)

    吕太; 车晟; 郭澄昆; 王旭东

    2013-01-01

    To study the effect of flow field on the dust absorption performance in a confined hood,numerical simulation of the gas-solid two-phase flow in a confined hood used in transshipment point of coal conveyor belt was carried out with Fluent.The analysis of gas flow field and distribution of coal dust concentration indicates that,with a larger flow deflection at chute turning point,the coal dust concentration will increase and the local coal dust accumulates more correspondingly.In addition,the analysis reveals that placket angle of the dust exhaust hood also had important influence on the dust absorption performance.In order to divert the gas flow as well as enhancing the effect of dust absorption,some optimization designs about the structure of chute turning point and the dust exhaust hood were devised.The result shows that,gas flow field and distribution of coal dust become more uniform and the dust absorption performance is improved after the optimization.Therefore,the present study provides some guidance for the optimization design of confined hood at the transshipment point of coal conveyor belt.%为了研究输煤皮带转载点密闭罩内流场对吸尘效果的影响,采用Fluent软件对某转载点密闭罩内气固两相流动情况进行了数值模拟.通过气流分布和煤尘浓度分布的分析,发现溜槽转折处较大的气流偏转会增加煤尘起尘量和导致局部煤尘积聚,吸尘罩的开口角度对吸尘效果也有较大影响.为了疏导气流并加强吸尘效果,提出了溜槽转折处和吸尘罩的结构优化设计方案.研究表明,改进后气流分布更加均匀,吸尘效果有所提高,从而为转载点密闭罩的优化设计提供了参考.

  11. TPU输送带用憎油涂层的制备及性能研究%Research on the Preparation and Properties of Oleophobic Coating Used for TPU Conveyor Belt

    Institute of Scientific and Technical Information of China (English)

    刘琳; 符春阳; 林文庆

    2011-01-01

    -NCO封端PU与丙烯酸羟基酯反应制得的PUA可UV固化.研究表明,热塑性聚氨酯弹性体输送带表面涂覆后从亲油变为憎油.当异福乐酮二异氰酸酯与聚四氢呋喃投料比为6:1(物质的量)、涂层干膜厚0.11mm、光固化90s时,甲基丙烯酸羟丙脂合成PUA的水接触角(或憎油角)达51.9°,丙烯酸羟丙酯合成PUA在TPU表面剥离强度达132.5N/m,交联剂用量为10%(质量分数,下同)时,涂层附着力为1级.%Polyurethane acrylate(PUA) prepared by the reaction between isocyanate-terminated polyurethane and acrylic hydroxyl resin can be covered on the surface of TPU conveyor by the way of UV curing. The coating obtained by this method behaves hydrophilic on its surface and excellent adhesion. Experiments show that the surface of the conveyor belt can be changed into oleophobic from pro-oil after covered, when IPDI and PTMG are added as the ratio of 6 : 1, the coating's dry-film-thickness is about 0. llmm, the UV curing time is 90s, HPMA is used in the synthesis, PUA has the best oleophobic property, its water contact angle(or called oleophobic angle) can reach up to 51.9°; PUA has the best peel strength when hydroxylpropyl acrylate is used in the synthesis, its 180° peel strength of this kind can reach up to 132. 5N/m, when the cross-linker HDDA added is 10wt%, the coating has the best adhesion, its the adhesion on tins can reach up to first class.

  12. 带式输送机新型驱动系统的开发与研究%Development and Research of a New-type Belt Conveyor Driving System

    Institute of Scientific and Technical Information of China (English)

    刘金丽

    2015-01-01

    Taking the new permanent magnetic drive system as the study object ,this paper introduced the characteristics of permanent magnet system. Then according to the use of permanent magnet driving system feedback situation ,we described in detail the measures to improve the shortcomings ,and used ANASY software to analyze the permanent magnet motor calculation. The simulation results showed that the new drive system for belt conveyor in the mine has the advantages of high efficiency,energy saving,high starting torque,low noise,maintenance free,smooth running characteristics.%以新型永磁驱动系统为研究对象,介绍了永磁系统的特点,然后针对永磁驱动系统的使用反馈情况,详细地阐述了不足之处的改进措施,并采用ANASY软件对永磁电机进行了分析计算。通过改进得知,新型驱动系统用在矿井带式输送机上具有高效、节能、起动转矩大、免维护、低噪声、运行平稳等特点。

  13. 基于离散元法的水平螺旋输送机仿真模拟与分析%Simulation and Analysis of the horizontal screw conveyor Based on the Discrete Element Method

    Institute of Scientific and Technical Information of China (English)

    于瑞江; 汤晓华; 张玉玲

    2015-01-01

    Based on the discrete element method, using Inventor to establish a three dimensional model of horizontal screw conveyer, to import the model into EDEM software simulation. It was gained by analyzing that when the rotational speed of the screw conveyer and the volumetric fill level was 200 rpm and 20% respectively, transporting a certain mass material consumed power was to minimize; Through simulation obtain the average speed change rule of rice grain and the force situation of screw conveyor, when the volumetric fill level is 20%, 50%, 70%.%基于离散元法,应用Inventor软件建立水平螺旋输送机三维实体模型,将该模型导入EDEM软件进行仿真模拟。分析验证了水平螺旋输送机转速和填充率分别为200r/min和20%时,螺旋输送机输送一定质量物料消耗的功率最小;通过仿真模拟得出填充率为20%、50%、70%时大米颗粒平均速度变化规律以及螺旋输送机受力情况。

  14. Fatigue Analysis of the Screw Conveyor Shaft Based on S-N Curve%基于S-N曲线的螺旋输送机主轴疲劳分析

    Institute of Scientific and Technical Information of China (English)

    李大平; 薛静; 刘学; 陈亮

    2014-01-01

    For the rear-driving screw conveyor of the shield machine,the finite element method followed by classic S-N curve is used to perform the fatigue life analysis of its shaft.With the help of the analysis,we can easily design the opti-mized structure to make sure that the screw works safely and efficiently during the whole construction process.%针对后部驱动结构形式的盾构螺旋输送机,采用先进的有限元分析再基于S-N曲线的方法,对其主轴进行疲劳寿命分析,并将此分析结果作为对主轴进行优化设计的依据,确保螺旋输送机在整个施工过程中能够正常高效工作。

  15. Experimental Study the Conveying Capability of Screw Conveyor Affected by Rotation Speed and Feeding Amount%螺旋输送装置转速和喂入量对输送性能的影响试验研究

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光; 赵圆圆; 王金莲

    2015-01-01

    This dissertation applies the experimental study to studying the performance of conveying affected by feeding a-mount and screw speed.The higher screw rotational speed, the greater power consumption.But the throughput increases with infinite speed, and the speed of 102 r/min when reach maximum throughput.The greater feeding amount, the grea-ter throughput,and greater the power consumption of conveyor Therefore should chose the reasonable rotation speed and feeding amount that can meet the production requirements in practical application.%通过试验,研究喂入量和螺旋转速对输送量和功耗的影响。试验结果表明:螺旋转速越高、输送装置的功耗越大,但输送量不随转速无限增大,当转速达到102 r/min 时输送量达到最大值;喂入量越大,输送量越大,输送装置的功耗也随之增加。因此,在实际应用中能满足生产需求的情况下,转速和喂入量不宜过高。

  16. Simulated Analysis on Dynamic Characteristics of ZS60600F Cooling Conveyor Shake Sifter Based on ADAMS%基于ADAMS的ZS60600F型冷却输送振动筛动态特性仿真分析

    Institute of Scientific and Technical Information of China (English)

    李吉伟; 陈秀娟; 崔继强

    2011-01-01

    针对消失模铸造用ZS60600F型冷却输送振动筛,运用系统仿真软件ADAMS,建立振动筛虚拟样机模型.通过分析振动筛力学模型,在ADAMS/Vibration模块建立与实际等价的振动分析模型,对虚拟样机进行振动分析,得出振动筛系统动态特性,为振动筛动态设计提供必要的基础数据.%Using system simulation software ADAMS, the virtual prototype model of ZS60600F cooling conveyor shake sifter for EPC process was created. By analyzing the mechanical model of the shaker, the equivalent vibration analysis model with actual model in ADAMS / Vibration module was established. The vibration analysis to the virtual prototype model was performed, and the dynamic characteristics of the shaker were obtained, which provide the necessary basic data for dynamic design of shaking sifter.

  17. 刮板输送机链传动系统动态仿真分析%Dynamic Simulation Analysis of the Ring Chain Transmission System of the Armoured Face Conveyor

    Institute of Scientific and Technical Information of China (English)

    王志高; 卢学军; 张颖越

    2013-01-01

    In order to analyze the dynamic behavior of the ring chain transmission system of the armoured face conveyor,its simulation model was established based on the finite element rigid body method. The dynamic behavior of the ring chain transmission system was simulated with Matlab/Simulink Package. The distribution of velocity,acceleration and tension on the chain was analyzed under normal and chain stuck conditions. The preloading force of the chain transmission system was also discussed. The results can provide some useful reference for the matching of comprehensive mechanized coal mining equipment.%为研究刮板输送机链传动系统的动力学特性,基于有限元刚体法建立其数学模型,并采用Matlab/Simulink软件包建立刮板输送机链传动系统的动力学仿真模型,分析其在正常启动、意外卡链等工况下,运行速度、加速度以及张力在链条上的分布规律,并分析了施加预紧力对系统造成的影响,可为综采设备的合理配置提供参考依据。

  18. Study on self-adaptive control system of tandem-disked continuous conveyors%串联盘式输送机自适应控制系统的研究

    Institute of Scientific and Technical Information of China (English)

    刘尚启; 付晓东

    2011-01-01

    In view of many uncertainties and variation of parameters with time during the operation of the tandem-disked continuous conveyor, the method of analyzing the discrete control system and the system identification principle are used to sample and process the input and output data of the experimental prototype. The least square method is used to estimate the parameters, and the parametric model in a certain state is obtained. The simulation results show that the least square method can offer good estimation for the model parameters.%针对串联盘式输送机运行过程中的许多不确定因素和参数时变的特点,采用离散控制系统的分析方法和系统辨识原理,对试验样机的输入输出数据进行采样处理,用最小二乘法的一次完成算法进行参数估计,得到系统某一状态的参数模型.仿真结果显示,最小二乘法能够给出系统模型参数的良好估计.

  19. 油菜割晒机拨指输送链式输送装置研制与试验%Development and experiment of rape windrower transportation device with poke finger conveyor chain

    Institute of Scientific and Technical Information of China (English)

    金诚谦; 尹文庆; 吴崇友

    2013-01-01

    The rape plant area is the largest in oil-bearing crops in China, and accounts for a quarter of the total rape plant population in the world. However, the uneven maturity of this rape limits the development of rape harvest mechanization. Rape partition harvest technology is composed of windrowing technology and collecting threshing technology. The rape plant is cut in the first stage, maturity. Maturity consistency and plant type are not important in the rape windrowing operation. It has the advantage of strong adaptability and a long harvest time. So rape partition harvest technology has an extensive market foreground and utility value. Windrowing technology is a difficulty in rape partition harvest technology. How to solve the problems of windrowing and transportation are the main and most difficult points in the process of designing a windrower. Focusing on the problem of windrowing and transporting in rape windrowing, a rape windrower with a vertical cutter, level cutter, machine frame, poke finger conveyor chain, driveline component, interface component, and reel device was designed. This machine was hitched with a combine chassis with functions of cutting, transporting, and windrowing. A transportation device was composed of 4 strips on a rotation poke finger conveyor chain;the poke finger conveyor chain was installed in chains. The poke finger was articulated on the chain, so it could stick out and retract while controlled by a guide in locked position. Rape plant on the transportation device was transported to an outlet by the exsertion poke finger, It was windrowed in the field when the poke finger was retracted in the outlet. The requirements of the outlet structure design were given in this paper. Based on analysis of the action process of reel and rape plants, parameters of expression of level and vertical distance between reel and cutter were established, and correlation between the installation angle of the transportation part and push angle of the

  20. The Analysis of the Tribological Properties of the Armoured Face Conveyor Chain Race / Badania WŁASNOŚCI Tribologicznych PŁYTY ŚLIZGOWEJ PRZENOŚNIKA ZGRZEBŁOWEGO

    Science.gov (United States)

    Krawczyk, Janusz; Pawłowski, Bogdan

    2013-12-01

    Generally, the power and capacity of the armoured face conveyor (AFC) are determined by the motor size, pan width and chain size. It is well known that the dynamic behaviour of an AFC drive has a significant influence on tension in the AFC chain, and is therefore critical in determining the reliability of the chain and the entire AFC system. However, the chain long service life is also affected by tribological contact with the chain race plate of the AFC and with the coal. The main objective of this work was to determine the tribological properties of AFC twin chain race (top plate). Characterization of the twin chain race, made of the Hardox 450 abrasion resistant steel, included microstructural examination by light microscopy, hardness test, X-ray diffraction and examination of tribological properties. The studies were carried out on samples cut from top plate of the whitdrawn face conveyor twin chain race. It was found, that the Hardox450 steel has quite good wear resistance for such purpose as AFC twin chain race. It is possible to use more wear resistant material than Hardox 450 steel but it would cause premature wear of the AFC chain. Parametry użytkowe górniczego ścianowego przenośnika zgrzebłowego są określane m.in. przez moc silnika, szerokość przenośnika oraz rozmiar łańcucha. Dynamiczne warunki pracy przenośnika zgrzebłowego mają istotny wpływ na wielkość naprężeń w łańcuchu i determinują niezawodność łańcucha i całego przenośnika zgrzebłowego. Na czas bezawaryjnej pracy łańcucha ma również wpływ szereg innych czynników, w tym zużycie tribologiczne ogniw łańcucha wskutek kontaktu ciernego z dnem rynny przenośnika oraz transportowanym urobkiem. Głównym celem pracy było określenie własności tribologicznych rynny przenośnika zgrzebłowego wykonanej z odpornej na ścieranie stali Hardox 450. Wykonano badania metalograficzne, pomiary twardości, badania rentgenowskie oraz próby tribologiczne. Stwierdzono,

  1. 试论螺旋输送机圆柱螺旋叶片简易制作工艺及安装方法%On the Simple Craftsmanship and Installation Method of the Cylindrical Spiral Blade of Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    郭在云

    2014-01-01

    讨论螺旋输送机圆柱螺旋叶片的制作工艺及安装方法,涉及叶片制作方法、叶片展开图的二种画法、叶片及传动轴焊接工艺分析等,论证企业自行生产、安装的可行性。通过理论分析和研究,结合生产实际,设计简易工艺加工圆柱螺旋叶片,对相关参数的确定进行分析。针对叶片、传动轴材料的焊接性能,制定了行之有效的焊接方案,在焊接细节方面,提出合理的建议和生产实际中总结的经验方法。%Introduced the screw conveyor of cylindrical spiral blade manufacture craft and the installation method,involving manufacture method of blade, blade expansion plan of two kinds of methods of making drawing, analyzed the technology about welding blade and transmission shaft, proved the feasibility of production and installation by enterprises their own. Through theoretical analysis and research,combined with the actual production,designed simple and easy process of cylindrical spiral blade,analyzed the determination of related parameters. For the blade and transmission shaft’s material,made the effective welding plan,in terms of welded details,put forward the reasonable suggestions and summarized the experience of the methods in practical production.

  2. 生物质连续热解反应装置的变螺距螺旋输送器设计%Design of Variable Pitch Spiral Conveyor for Biomass Continual Pyrolysis Reactor

    Institute of Scientific and Technical Information of China (English)

    蒋恩臣; 苏旭林; 王明峰; 熊磊明; 赵创; 许细微

    2013-01-01

    The biomass continuous pyrolysis reaction device with a variable pitch spiral conveyor was developed. To be more specific, the special screw conveyer was designed and optimized. Cold experiments showed that pyrolysis volatiles could be smoother to the end by way of combining the variable pitch with pros and cons screw. For general biomass, the productivity of the device was about 30 kg/h, and stay time was 5-10 min, which can meet the needs of pyrolysis reaction stably and continuously. Experimental research for various agriculture and forestry biomass could be carried out.%研制了带有变螺距螺旋输送器的生物质连续热解反应实验装置,对变螺距螺旋输送器参数进行了设计.冷态实验结果表明,变螺距与正、反向螺旋相结合的物料输送方式,更易于热解挥发物顺畅地由尾端排出,保证了连续热解反应的正常进行.该装置对一般生物质处理量约为30 kg/h,停留时间5~ 10 min,能满足连续稳定热解反应的要求,可开展多种农林生物质连续热解反应的实验研究.

  3. Research on Handy Plasma Coating on Intermediate Pan of Scraper Conveyor%手持式等离子熔覆刮板输送机中部槽的研究

    Institute of Scientific and Technical Information of China (English)

    刘鸣放; 张兵权; 马宗彬

    2011-01-01

    The handy plasma coating equipment was applied to the high boron Fe-Cr alloy coating on the intermediate pan of the mine scraper conveyor and an abrasive test was conducted on the coating. The results showed that the costing was mainly consisted with γ (Fe, Ni),(Cr, Fe)2B, Fe2B, Fe23(C,B)6 and other phases. With the boron content increased steadily from 2. 5% to 5. 5% , the hardness and abradability of the coating would be increased and then decreased. When the boron content was 4.5% , the relative abrad ability of the coating would be 5.4 times higher than the basic material. The underground test showed that the service life of the intermedi ate pan with the coating would be increased by 2 ~3 times.%采用手持式等离子熔覆设备,在煤矿用刮板输送机中部槽表面熔覆高硼Fe-Cr合金层,并对其进行磨损试验.结果表明:熔覆层主要由γ-(Fe,Ni)、(Cr,Fe)2B、Fe2B和Fe23(C,B)6等物相组成;随着含硼量由2.5%逐步增加至5.5%,熔覆层的硬度和耐磨性呈先增大后降低趋势;含硼量为4.5%时,熔覆层的相对耐磨性是基材的5.4倍.井下试验表明,熔覆后中部槽使用寿命可延长2~3倍.

  4. Design and Analysis of Hydraulic System of Disc Brake for Downward Belt Conveyor%下运带式输送机盘式制动器液压系统设计与分析

    Institute of Scientific and Technical Information of China (English)

    刘灿杰; 贾跃虎; 刘志奇

    2011-01-01

    通过分析下运带式输送机制动工况的特点以及盘式制动器的优点,设计出适合各制动工况要求的新型盘式制动器液压系统.该液压系统具有松闸、保压、正常停车制动、超速制动、紧急制动和系统突然断电制动等功能.建立了系统的数学模型,将数学模型线性化后推导出了系统传递函数,分析了各元件参数对系统响应性的影响,为设计压力精细调节的制动器提供了理论基础.%The characteristics of braking condition of downward belt conveyor and advantages of disc brake were analyzed. A new hydraulic system of disc brake which met each braking condition requirement was designed. This hydraulic system have functions of loose braking, the normal parking braking, emergency braking and suddenly lose power braking. The mathematical model of this hydraulic system was established. The transfer function of this hydraulic system was deduced by the mathematical model linearization. The influences of the parameters to the response of the system were analyzed. The research work lays theory foundation for the design of brake with pressure fine adjustment.

  5. 揉碎玉米秸秆螺旋输送性能试验分析%Test and analysis of performance of screw conveyor for rubbing and breaking corn straw

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光; 祁少华; 闫建国; 王金莲

    2015-01-01

    Screw conveyor is one of most important agricultural machineries for crop harvest and fiber materials processing. The advantages of screw conveyor include simple structure, small volume, compact total size, easy operation and management, and good seal. There are 3 major problems in use that are high loss of power,low productivity and transmission inefficiency. This study was to explore the method to reduce power consumption and improve efficiency and productivity in transportation. First, with stress analysis of the screw blade, the research found the factors that influenced the force of the blade. This research also designed blade stress test system and power test system by using thin-film pressure sensors, data acquisition unit, signal receiver, torque speed sensor and computer. The experiment was implemented by taking the screw conveyor as experimental platform, which was developed by the project group. The parameters of the experimental platform were as follows: the conveying gap length was 2 500 mm, the diameter of the screw blade was 250 mm, the diameter of the center axis was 60 mm, the pitch was 200, 250 and 300 mm respectively, and the space between the screw blade and the casing was 5-8 mm. The experiment samples were from the corn stalks rubbed and broken by the 9R-40 type rubbing machine, which had less than 180 mm length, 2-8 mm width, and 43.98% moisture content. Based on the performance index such as pressure on the blade, transmission power, productivity and transmission efficiency, the experiment studied the impact of pitch, speed, and feeding quantity on transportation performance. The results showed that: 1) Under the same pitch, the closer to the outer edge, the greater the pressure on the helical blade, and the pressure at inner diameter was the minimum. On the same shaft, the pressure was different at different points of screw blade, the closer to the spout, the greater the pressure on all parts of the blade. 2) When the speed was 58 r/min and

  6. Principle and Application of Control System with Binary Coding Starting Resistance for Long-Distance Belt Conveyor%长胶带机二进制编码起动电阻控制系统的原理及应用

    Institute of Scientific and Technical Information of China (English)

    王晓东

    2000-01-01

    This paper describes the principle of control system with binary coding starting resistance for longdistance belt conveyor and its application in engineering,introduces simply the calculate method for binary coding starting resistance%论述了长距离胶带机二进制编码起动电阻控制系统的原理以及在工程中的应用,并简要介绍了二进制编码电阻的计算方法。

  7. TRIZ理论在螺旋输送机磨损问题中的应用研究%Application and research of TRIZ theory in wear of screw conveyor

    Institute of Scientific and Technical Information of China (English)

    韩彦良

    2012-01-01

    Based on further study theory of TRTZ for solving technical contradiction, it is concluded that technology and physical contradictions can be converted into each other.In solving contradiction process of technology system,it is proposed to transform technology contradictions into physical contradictions, which may help grasp the Essential Feature of contradiction to make Ideas more clearly by the use of improved model.Concerning the serious weariness caused by tiny materials being squeezed into the bearing block of the screw conveyor,an innovation plan to replace disk flange by a horseshoe flange has been proposed through applying comprehensively the separation principle and innovation principle in order to convert the technical contradictions into physical contradictions,which has solved the problem effectively.%在对TRIZ理论解决技术系统矛盾问题理论深入研究的基础上,认为技术矛盾和物理矛盾是可以相互转化的.改进目前TRIZ理论解决矛盾问题的一般流程,提出在应用TRIZ理论解决技术系统矛盾过程中,应该尽量将技术矛盾转化为物理矛盾,能更好的抓住矛盾问题的本质特征,使解决问题的思路更清晰.针对螺旋输送机因细小物料挤入轴承座而造成的严重磨损问题,把技术矛盾转化为物理矛盾,通过分离原理与创新原理的综合应用,提出了用马蹄形法兰代替盘形法兰解决问题的创新性方案,有效的解决了问题.

  8. Smart Idlers: RFID in conveyor belt monitoring

    NARCIS (Netherlands)

    Pang, Y.

    2012-01-01

    Radio Frequency Identifi cation (RFID) is a technology that offers unique identifi cation of objects and processes. It can actively or passively communicate and, in combination with sensors, it can capture more detailed physical information. RFID technology has been integrated into our daily life.

  9. Smart Idlers: RFID in conveyor belt monitoring

    NARCIS (Netherlands)

    Pang, Y.

    2012-01-01

    Radio Frequency Identifi cation (RFID) is a technology that offers unique identifi cation of objects and processes. It can actively or passively communicate and, in combination with sensors, it can capture more detailed physical information. RFID technology has been integrated into our daily life.

  10. Preliminary Design, Vertical Stores Handling Conveyor

    Science.gov (United States)

    1977-05-01

    at 115.1 is out of not have full log position such over-the- torque that it would door jam between the protection tray and the door in a strike-up mode...fraction of an inch of nominal. A small demonstration/test unit has been alternately starting and stopping for several years and has logged over 18...Wihcatalog No. In Lb.c ore F Bore usng-Asaambiy __ Lbs._ T71 I1/8 /- Spcf N/A -1/4 TT2 �-1/- Sp1if/4-Secf TTIX 18to 30 31 ?6Specify Specify 1/ 18 Ia

  11. 链条输送式变量施肥抛撒机的设计与试验%Design and experiment of variable rate fertilizer spreader with conveyor chain

    Institute of Scientific and Technical Information of China (English)

    张睿; 王秀; 赵春江; 白由路; 孟志军; 陈立平

    2012-01-01

    针对国内变量施肥机作业幅宽小,变量施肥抛撒机缺乏的问题,该文应用变量施肥技术,设计了一种基于处方图的链条输送式变量施肥抛撒机.通过分析肥料颗粒在撒肥盘上的运动和受力,建立了肥料颗粒在脱离撒肥机圆盘过程中的运动方程,设计并确定了变量抛撒控制系统、肥箱、肥门自动开启装置等关键部件的结构及参数.并进行了不同施肥量和抛撒均匀性的试验,结果表明:链条输送式变量施肥抛撒机变量效果较好,且具有较好的抛撒均匀性,在拖拉机速度1.5 m/s,实际施肥量与预置施肥量相对误差最大值为7.53%;拖拉机速度2m/s,目标施肥量225 kg/hm2,抛撒幅宽设定30m,有效幅宽抛撒变异系数为14.90%,能够较好的满足实际生产要求.%To solve the problem of lacking suitable variable rate fertilizer spreader in China, a variable rate fertilizer spreader with conveyor chain based on prescription map was designed. A motional equation of fertilizer granular at the moment of thrown from disc border was established through analyzing force and motion of fertilizer granular at spreader disc, and then the system of key components was designed and the corresponding machinery parameters were confirmed, such as variable rate control system, fertilizer box, the auto-opening device of gate etc. The experiments on different fertilizer amount and uniformity were conducted with a variable rate fertilizer spreader. Results showed that the spreader's effect of variable rate fertilization and uniformity of the spreader was better. When the speed of tractor was 1.5 m/s, relative error between actual application amount and pre-setting amount was less than 7.53%. When the speed of tractor was 2 m/s, the coefficient of variance was 14.90%, fertilization amount was 225 kg/hm2 and the spreader breadth was 30 m, which indicates the spreader can meet the need of practical production.

  12. THE METHOD OF TE IMPROVEMENT OF POWER AND ACOUSTIC PARAMETERS OF TAPE CONVEYORS ON A HOVERCRAFT Метод улучшения энергетических и акустических показателей ленточных конвейеров на воздушной подушке

    OpenAIRE

    Murzinov V. L.; Murzinov P. V.

    2012-01-01

    The method of control of the amount of flow area of the supply nozzles in tape conveyor on a hovercraft is considered in the article. The local system that implements the principle of direct action to control the thickness of the air cushion is shown. Based on the hydrodynamic model, the formula for the engineering calculations of values of the moving devices are determined

  13. Adaptation of the TAS (Technical Specifications for Hoisting Equipment and Slope Conveyors) to the new DIN 1880 and Eurocode 3 (DIN ENV 1993, part 1-1); Anpassung der 'Technischen Anforderungen an Schacht- und Schraegfoerderanlagen' (TAS) an die Bemessungskonzepte der neuen bauaufsichtlich eingefuehrten Stahlbaunormen DIN 18800 und Eurocode 3 (DIN ENV 1993, T. 1-1)

    Energy Technology Data Exchange (ETDEWEB)

    Hufendiek, H.W. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Div.

    2001-07-01

    Shaft hoisting equipment is calculated on the basis of DIN, EN, or ISO standards. The most recent standard is the DIN 1889 of January 1996, which comprises a new safety concept. In consequence, the TAS (Technical Specifications for Hoisting Equipment and Slope Conveyors) had to be modified to be compatible. The method of adaptation employed was published as a communication of Deutsches Institut fuer Bautechnik. [German] Vorschriften fuer die Errichtung von Schachtfoerderanlagen sind in den Richtlinien der Oberbergaemter bzw. der Bezirksregierungen, z.B. in den 'Technischen Anforderungen an Schacht- und Schraegfoerderanlagen' (TAS), Stand Dezember 1987, festgelegt. Fuer die einzelnen Bauteile der Schachtfoerderanlagen sind in diesen Richtlinien zum Teil Berechnungsmethoden vorgegeben, die sich auf DIN-, EN- oder ISO-Normen beziehen bzw. verweisen. Bei den Berechnungen von Stahlbaukonstruktionen, wie z.B. Fuehrungsgerueste, Fuehrungseinrichtungen, Buehnenkonstruktionen oder Verlagerungen von mechanischen Einrichtungen von Foerderanlagen, werden in den oben genannten Anforderungen bisher die DIN 18800 'Stahlbauten', Stand Maerz 1981, herangezogen. Seit laengerer Zeit liegt eine neue, bauaufsichtlich zugelassene Stahlbaunorm DIN 18800, Stand Januar 1996, vor, die damit die allgemein anerkannten Regeln der Technik fuer Stahlbauten darstellt. Die neue Stahlbaunorm wurde vollstaendig ueberarbeitet und fuer die Bemessung der Bauteile wurde ein neues Sicherheitskonzept gewaehlt. Demnach wurde es erforderlich, die TAS an die neue DIN 18800 und damit an das neue Bemessungskonzept anzupassen. Die Anpassung erfolgte in Anlehnung an die Vorgehensweise der 'Anpassungsrichtlinie Stahlbau', die in den Mitteilungen des Deutschen Institutes fuer Bautechnik veroeffentlicht wurde. (orig.)

  14. Processing and analysis the Reason for Producing the"Traveling wave"phenomenon of conveyor belt when beginning the boot process%输送胶带在启动时出现"行波"的原因分析与对策

    Institute of Scientific and Technical Information of China (English)

    邢锁斌

    2015-01-01

    内蒙古大唐国际托克托发电有限责任公司输煤系统新增圆管带式输送机(下称管带机)在试运启动时,尾部回程段处胶带出现"行波"现象,之后胶带被拉直恢复正常运行状态.这严重影响了管带机机架、托辊、胶带的使用寿命,降低了设备可靠性,系统存在很大的安全隐患.为此,对胶带启动时尾部回程段出现的"行波"现象进行了认真分析、计算,找出了问题产生的根本原因,并进行了相应的调整,消除了"行波"现象,提高了设备可靠性.%When starting trial operation, Inner Mongolia Datang International Tuoketuo Power Generation Co. Ltd.'s coal handling system which equipped with new pipe band type conveyor (hereinafter referred to as duct tape machine)"slack"at the return trip of the tail, and the belt is pul ed straight to resume normal opera-tion later. The working life of the machine frame of duct tape machine, rol er and belt are affected seriously. And the reliability of the equipment is reduced, therefore there is a big security risk of the system. For this reason, a thorough analysis of the"slack"phenomenon at the return trip of the tail is done to find out the primary cause. And the corresponding experiments and adjustments are carried out to eliminate the"slack"phenomenon and improve the reliability of the equipment.

  15. 基于粒子群算法的高黏度大比重物料无轴螺旋输送机构优化设计%Optimization design of shaft-less screw conveyor mechanism for high viscosity and large specific gravity materials based on PSO

    Institute of Scientific and Technical Information of China (English)

    张炎; 芮延年; 周宏伟; 童玉武

    2014-01-01

    为解决高黏度大比重物料无轴螺旋输送机的螺旋叶片变形问题,利用粒子群优化算法,以无轴螺旋叶片刚度变形最小为优化设计目标,构建了基于粒子群算法的无轴螺旋叶片优化设计模型。应用构建的理论模型,进行了实例设计,并通过实验研究进一步证实该设计方法具有先进性和实用性。将智能算法应用于机械优化设计,为该领域研究提供新思路。%Many users are plagued by the problem that screw blades of shaft-less screw conveyor are deformed when transport materials are with high viscosity and large specific gravity .The al-gorithm of particle swarm optimization (PSO) was used with the purpose of minimum deforma-tion of shaft-less screw stiffness .Firstly ,optimization design model of shaft-less screw blade was constructed based on particle swarm optimization .Then ,examples were designed with theoretical model constructed .Finally ,experimental research was studied to further confirm that the method designed was advanced and practical .Intelligent algorithm is applied in mechanical optimization design ,w hich provides new method for the research on the field .

  16. 输送机刮板刀架精密铸造尺寸精度和形位公差的控制%Dimensional Accuracy and Geometric Tolerance Control of Investment Casting C2, C2K Typed Blade Frame of Scraper for Conveyor

    Institute of Scientific and Technical Information of China (English)

    范修谦; 唐永蓉

    2011-01-01

    C2、C2K输送机刮板刀架设备要求主要安装尺寸精度为铸造CT2~3级.通过试制后调整模具尺寸、模具关键部位尺寸设计成0度起模斜度,用侧芯板和顶出机构起模、设计制造了硬蜡芯减少蜡件形状误差、使用专用修蜡刀修蜡,制订了合理的蜡模组树工艺、采用比较高的浇注温度确保刃口尺寸、铸件热处理后矫形后用专用检具和C形卡板控制刀架形位尺寸公差等措施,使铸件关键形位尺寸达到了CT2~3级精度要求.%The tolerance of the main installed dimension of C2, C2K typed blade fram of scraper for conveyor is required to be CT2~3 class. Through adjusting mould dimension, making the draft angle of some key location in the mould to 0, using side-core-board and push-out mechanism to take out the wax pattern, designing hard-wax core to reduce shaping error of the wax pattern as well as using special knife to repair the wax pattern, and setting rational wax pattern assembling tree , pouring with a higher temperature, CT2~3 class accuracy can be realized in the key location in the heat treated investment castings after controlling geometric tolerance with dedicated gauges and C shaped plate.

  17. 5d modeling of a chain conveyor with the help of compas-3d software 5d моделирование цепного транспортера в системе КОМПАС-3d

    Directory of Open Access Journals (Sweden)

    Kudryavtsev Evgeniy Mikhaylovich

    2012-04-01

    Full Text Available The methodology of concurrent engineering and research of products at initial stages of their design is provided in the article. The proposed methodology contemplates several stages: development of a 3D model of a product accompanied by its structural design analysis, the engineering analysis, including the dynamic analysis of a product (+1D and research of its deflected mode (+1D. The proposed procedure may be entitled as "5D Product Modeling". Concurrent engineering and research of a product improves the efficiency and the quality of design, while the number of errors goes down at the initial stages of design development of any mechanical system. 3D model of a chain conveyor was developed on the basis of one of the most widely spread systems of computer-aided design - COMPAS-3D software developed by ASKON company. Static, kinematic, and dynamic analyses, associated with the chain conveyor, were performed with the help of the Universal Mechanism Express system integrated into COMPAS-3D software. Analysis of the deflected mode of the chain conveyor joints exposed to maximal loads was performed with the help of APN FED software integrated into COMPAS-3D software. APN FED software was used to simulate various loads, to simulate various limit conditions, to generate a mesh of finite elements and to perform the final calculations. One dynamic and one refined mathematical model of the drive and of the whole chain conveyor were developed to verify the adequacy of the research performed within the framework of the project in question. Dynamic loads applicable to elements of the chain conveyor were identified through the employment of MathCAD software.Изложена методика комплексного проектирования и исследования изделия на ранних этапах проектирования. Эта методика включает ряд этапов: создание трехмерной модели

  18. Water: The conveyor belt for sustainable livelihoods and economic development

    Science.gov (United States)

    Mapani, Benjamin; Meck, Maideyi; Makurira, Hodson; Magole, Lapologang; Mashauri, Damas; mazvimavi, Dominic; Mul, Marloes

    2016-04-01

    The theme for the 2014 symposium focused on the contribution of integrated water resources management (IWRM) to socio-economic development. A number of papers presented various methods that could be used to enable society to access clean water; sanitation and provision of water for rainfed and irrigation based agriculture and aquaculture. Water is the engine of development, that drives both money generating ventures as well as activities which cannot be assigned exact monetary value, but are essential for the social and economic well being of communities. It is now accepted that in order to produce most products, the contribution of water has to be factored in; from manufacturing to mining. The role that water plays in the has a much higher economic value than most people realize.

  19. Endothelial microparticles as conveyors of information in atherosclerotic disease.

    Science.gov (United States)

    Schiro, A; Wilkinson, F L; Weston, R; Smyth, J V; Serracino-Inglott, F; Alexander, M Y

    2014-06-01

    Endothelial microparticles (EMPs) are complex submicron membrane-shed vesicles released into the circulation following endothelium cell activation or apoptosis. They are classified as either physiological or pathological, with anticoagulant or pro-inflammatory effects respectively. Endothelial dysfunction caused by inflammation is a key initiating event in atherosclerotic plaque formation. Athero-emboli, resulting from ruptured carotid plaques are a major cause of stroke. Current clinical techniques for arterial assessment, angiography and carotid ultrasound, give accurate information about stenosis but limited evidence on plaque composition, inflammation or vulnerability; as a result, patients with asymptomatic, or fragile carotid lesions, may not be identified and treated effectively. There is a need to discover novel biomarkers and develop more efficient diagnostic approaches in order to stratify patients at most risk of stroke, who would benefit from interventional surgery. Increasing evidence suggests that EMPs play an important role in the pathogenesis of cardiovascular disease, acting as a marker of damage, either exacerbating disease progression or triggering a repair response. In this regard, it has been suggested that EMPs have the potential to act as biomarkers of disease status. In this review, we will present the evidence to support this hypothesis and propose a novel concept for the development of a diagnostic device that could be implemented in the clinic. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.

  20. The Conveyor Belt Problem and Newton's Third Law.

    Science.gov (United States)

    Stewart, Maurice Bruce

    1989-01-01

    Shows how the thermal power developed by friction is exactly half the supplied power in the general case of a variable force of friction. Investigates the mechanism whereby one-half the input energy is dissipated as heat using mathematical expressions. (YP)

  1. Merlon-type density waves in a compartmentalized conveyor system

    Science.gov (United States)

    Kanellopoulos, G.; van derWeele, K.

    2016-09-01

    Multi-particle flow through a cyclic array of K connected compartments with a preferential direction is known to be able to organize itself in the form of density waves [Kanellopoulos, Van der Meer, and Van der Weele, Phys. Rev. E 92, 022205 (2015)]. In this brief note we focus on the intriguing shape these waves take when K is even, in which case they travel through alternatingly dense and diluted compartments. We call them "merlon waves", since the sequence of high and low densities is reminiscent of the merlons and crenels on the battlements of medieval castles.

  2. A Nanofiber-Based Optical Conveyor Belt for Cold Atoms

    CERN Document Server

    Schneeweiss, Philipp; Mitsch, Rudolf; Reitz, Daniel; Vetsch, Eugen; Rauschenbeutel, Arno

    2012-01-01

    We demonstrate optical transport of cold cesium atoms over millimeter-scale distances along an optical nanofiber. The atoms are trapped in a one-dimensional optical lattice formed by a two-color evanescent field surrounding the nanofiber, far red- and blue-detuned with respect to the atomic transition. The blue-detuned field is a propagating nanofiber-guided mode while the red-detuned field is a standing-wave mode which leads to the periodic axial confinement of the atoms. Here, this standing wave is used for transporting the atoms along the nanofiber by mutually detuning the two counter-propagating fields which form the standing wave. The performance and limitations of the nanofiber-based transport are evaluated and possible applications are discussed.

  3. A "Conveyor Belt" Model for the Dynamic Contact Angle

    Science.gov (United States)

    Della Volpe, C.; Siboni, S.

    2011-01-01

    The familiar Young contact angle measurement of a liquid at equilibrium on a solid is a fundamental aspect of capillary phenomena. But in the real world it is not so easy to observe it. This is due to the roughness and/or heterogeneity of real surfaces, which typically are not perfectly planar and chemically homogeneous. What can be easily…

  4. Nano-guided cell networks as conveyors of molecular communication.

    Science.gov (United States)

    Terrell, Jessica L; Wu, Hsuan-Chen; Tsao, Chen-Yu; Barber, Nathan B; Servinsky, Matthew D; Payne, Gregory F; Bentley, William E

    2015-01-01

    Advances in nanotechnology have provided unprecedented physical means to sample molecular space. Living cells provide additional capability in that they identify molecules within complex environments and actuate function. We have merged cells with nanotechnology for an integrated molecular processing network. Here we show that an engineered cell consortium autonomously generates feedback to chemical cues. Moreover, abiotic components are readily assembled onto cells, enabling amplified and 'binned' responses. Specifically, engineered cell populations are triggered by a quorum sensing (QS) signal molecule, autoinducer-2, to express surface-displayed fusions consisting of a fluorescent marker and an affinity peptide. The latter provides means for attaching magnetic nanoparticles to fluorescently activated subpopulations for coalescence into colour-indexed output. The resultant nano-guided cell network assesses QS activity and conveys molecular information as a 'bio-litmus' in a manner read by simple optical means.

  5. Experimental setimeted of the some parameters of the conveyor belts

    Directory of Open Access Journals (Sweden)

    Marasová Daniela

    2001-12-01

    Full Text Available At present one of the most spread methods able to solve non-linear problems of the mechanics is theis the finite-element method. When solving problems of hyperelasticity by the finite-element method (FEM for introducing the input materials' constants of the body investigated, best - thought-out Money-Rivlin's theory is used. It is the method describing the behaviour of hyper-elastic materials with large elastic (reversible deformations. For the description of behaviour of the hyperelastic materials, can be used also the development from more members, comprising 5 or 9 materials' constants. The problem with the determining the hyperelastic materials' characteristics is one of the most important factors effecting the accuracy of the calculation result. The material's constants A and B are det-rmined experimentally from the practical tests, e.g.tensile, compressive or other and have to meet certain conditions. The paper shows the possibility how to determinate these matherials´ charakteris-tics and their verification by the mathematical model ANSYS.

  6. Discrete-Event Modelling of Conveyor Lines Дискретно-событийное моделирование конвейерных линий

    Directory of Open Access Journals (Sweden)

    Tymohyn Volodymyr M.

    2013-09-01

    Full Text Available The goal of the article is a study of specific features of application of discrete-event modelling in the process of making managerial decisions connected with re-trimming of a conveyor line of a major industrial enterprise. Analysing and systemising scientific works of domestic and foreign scientists, the author focuses on insufficiency of development of issues connected with application of simulation modelling to re-trimming of conveyor lines. The article considers aspects of discrete-event modelling in the process of making managerial decisions connected with identification of bottle-necks of the system using methodology of the limitations theory and analysis of possibilities of their elimination, i.e. increase of effectiveness of system functioning. The author provides a discrete-event model of the process of compressor assembly. The provided model allows detection of bottle-necks in the system and also analysis of various possibilities of their elimination.Целью статьи является исследование особенностей применения дискретно-событийного моделирования в процессе принятия управленческих решений, связанных с перебалансировкой конвейерной линии крупного промышленного предприятия. Анализируя и систематизируя научные работы отечественных и зарубежных ученых, автор акцентирует внимание на недостаточности разработки вопросов, связанных с применением имитационного моделирования к перебалансировке конвейерных линий. В статье рассмотрены аспекты дискретно-событийного моделирования в

  7. Comparison of a wire belt conveyor and cross auger conveyor for conveying burr cotton on a stripper harvester

    Science.gov (United States)

    Cotton fiber quality begins to degrade naturally with the opening of the boll, and mechanical harvesting processes are perceived to exacerbate fiber degradation. Previous research indicates that stripper-harvested cotton generally has lower fiber quality including on average lower micronaire, length...

  8. Role of fumigation in labour conditions characteristic of the grain transport conveyor workers = Роль фумигации в характеристике условий труда рабочих зернового транспортного конвейера

    OpenAIRE

    Shafran, L. M.; Sidorenko, S. G.; Golikova, V. V.; Zukow, W.

    2015-01-01

    Shafran L. M., Sidorenko S. G., Golikova V. V., Zukow W. Role of fumigation in labour conditions characteristic of the grain transport conveyor workers = Роль фумигации в характеристике условий труда рабочих зернового транспортного конвейера. Journal of Education, Health and Sport. 2015;5(10):350-362. ISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.45341 http://ojs.ukw.edu.pl/index.php/johs/article/view/3355 https://pbn.nauka.gov.pl/works/709979 Formerly Journal of Health Sci...

  9. Novel Grounded Capacitor All-Pass and Notch Filters Using Current Conveyors and Differential Amplifier

    Directory of Open Access Journals (Sweden)

    R. Saraswat

    2003-01-01

    Full Text Available Three circuits each realizing second-order all-pass/notch filter transfer functions are reported. All circuits use grounded capacitors and are suitable for IC implementation. These circuits offer the advantages of high input impedance and low output impedance and are superior to all earlier realisations.

  10. Modification of the screw conveyor%螺旋输送机的技改

    Institute of Scientific and Technical Information of China (English)

    许成章

    2008-01-01

    针对螺旋输送机存在的问题进行亍技改:经过计算重新选定驱动电机及减速机;将螺旋轴与机壳制成可拆装结构;将机壳两端的填料密封改为可拆换的迷宫式密封.达到设备维护简单,更换零件方便,密封效果良好,有效地延长了螺旋输送机及轴承的寿命.

  11. Best cost country sourcing : optimising the value of conveyor belts for coal mining companies

    OpenAIRE

    2014-01-01

    M.Com. (Business Management) Background Best cost country sourcing is a relatively new concept and not many organisations are utilising this specific process nor are they optimising this as their sourcing strategy. Best cost country sourcing is one of the most profound sourcing processes available, and it has the ability to increase an organisation’s efficiency and effectiveness if implemented correctly. Purpose The purpose of this study is to determine if best cost country sourcing should...

  12. Magnetic conveyor belt transport of ultracold atoms to a superconducting atomchip

    CERN Document Server

    Minniberger, Stefan; Haslinger, Stefan; Hufnagel, Christoph; Novotny, Christian; Lippok, Nils; Majer, Johannes; Schneider, Stephan; Schmiedmayer, Jörg

    2013-01-01

    We report the realization of a robust magnetic transport scheme to bring 3x10^8 ultracold 87Rb atoms into a cryostat. The sequence starts with standard laser cooling and trapping of 87Rb atoms, transporting first horizontally and then vertically through the radiation shields into a cryostat by a series of normal- and superconducting magnetic coils. Loading the atoms in a superconducting microtrap paves the way for studying the interaction of ultracold atoms with superconducting surfaces and quantum devices requiring cryogenic temperatures.

  13. Programmable Voltage-Mode Multifunction Filter Using Two Current Conveyors and One Operational Transconductance Amplifier

    OpenAIRE

    Muhammad Taher Abuelma'atti; Azhar Quddus

    1996-01-01

    A new voltage-mode active-filter with single input and three outputs is presented. The parameters of the proposed filter are programmable and the filter uses grounded capacitors. The proposed circuit can simultaneously realize lowpass, highpass, and bandpass biquadratic filter functions and enjoys low temperature sensitivities.

  14. Economical conveyor link between Lohberg and Osterfeld. Wirtschaftliche Foerderverbindung Lohberg-Osterfeld

    Energy Technology Data Exchange (ETDEWEB)

    Crumbiegel, K.; Hoelter, G. (Ruhrkohle Bergbau AG (Germany). Bergwerk Westerholt)

    1994-05-12

    Following the merging of the Lohberg and Osterfeld collieries to form the Lohberg-Osterfeld combined colliery an underground belt road for product conveyance had to be planned and constructed. The main aspect of the planning was to select the cheapest equipment, the operating costs as well as the purchase costs being taken into account for this purpose. The variable-speed electric motor, which is connected positively without a hydraulic coupling to the belt drive gear, and different variants of the usual belt drive with hydraulic coupling between electric motor and gear were compared. It was shown that the higher purchase costs of the variable-speed electric motor compared to those of the drive with hydraulic couplings are paid off after two operating years. 4 figs., 4 tabs.

  15. An alternative to the screw conveyor; Una alternativa a los tornillos de arquimedes

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Colina, V.; Ramos Gonzalez, F.L. [TFB-Madrid (Spain)

    1995-12-31

    Flygts submersible pump system was chosen because it was both cost effective and reliable and required minimum alterations to the intake section. This was achieved by using the old hollow shafts of the screw pumps as pressure tubes, on to which the discharge connections were mounted. This contribution to the Pinedo sewage treatment plant is one of the successful projects conducted by TFB in close collaboration with consultants and municipalities large and small.

  16. Advanced nutrient root-feeding system for conveyor-type cylindrical plant growth facilities for microgravity

    Science.gov (United States)

    Berkovich, Yu. A.; Krivobok, N. M.; Krivobok, A. S.; Smolyanina, S. O.

    2016-02-01

    A compact and reliable automatic method for plant nutrition supply is needed to monitor and control space-based plant production systems. The authors of this study have designed a nutrient root-feeding system that minimizes and regulates nutrient and water supply without loss of crop yields in a space greenhouse. The system involves an ion-exchange fibrous artificial soil (AS) BIONA-V3TM as the root-inhabited medium; a pack with slow-release fertilizer as the main source of nitrogen, phosphorus, and potassium; and a cartridge with granular mineral-rich ionite (GMRI) as a source of calcium, magnesium, sulfur, and iron. A controller equipped with an electrical conductivity meter controls the solution flow and concentration of the solution in the mixing tank at specified values. Experiments showed that the fibrous AS-stabilized pH of the substrate solution within the range of 6.0-6.6 is favorable to the majority of crops. The experimental data confirmed that this technique allowed solution preparation for crops in space greenhouses by means of pumping water through the cartridge and minimization of the AS stock onboard the space vehicle.

  17. Oscillation and collective conveyor of water-in-oil droplets by microfluidic bolus flow

    CERN Document Server

    Ohmura, Takuya; Kamei, Ken-ichiro; Maeda, Yusuke T

    2015-01-01

    Microfluidic techniques have been extensively developed to realize micro-total analysis systems in a small chip. For microanalysis, the trapping or arranging of objects in a line is a critical step. Physical effects such as inertial lift force have been utilized so far, however, hydrodynamic interaction in a many body system is yet to be explored despite its relevance to pattern formation. Here, we report water-in-oil (W/O) droplets can be transported with sequential order in the grid of one-dimensional array of another large W/O droplets. As each droplet comes close to an interspace of the large droplet array, while exhibiting persistent back-and-forth motion, it is conveyed at a velocity equal to the droplet array. The droplet also makes asymmetric orbit to and from the large droplet behind, suggesting vortex like stream was involved. We confirm the appearance of closed streamlines, which called bolus flow, in numerical simulation based on lattice Boltzmann method. The existence region of bolus flow account...

  18. Long-term treatment of bipolar disorder with a radioelectric asymmetric conveyor

    Directory of Open Access Journals (Sweden)

    Mannu P

    2011-06-01

    Full Text Available Piero Mannu1, Salvatore Rinaldi1,2, Vania Fontani1, Alessandro Castagna11Rinaldi-Fontani Institute, Department of Neuro-Psycho-Physio Pathology, Florence, Italy; 2School of Occupational Medicine, University of Florence, Florence, ItalyBackground: The bipolar spectrum disorders are considered an important and frequent psychiatric problem. The clinical complexity of these illnesses due to the coexistence of depressive and excitative phases is correlated with the global difficulty of adequate treatment; consequently, the prognosis is not optimal. For this reason, in recent years, novel nonpharmacologic physical approaches have been tested for bipolar disorders, with encouraging results. The aim of this study was to evaluate the long-term effectiveness of a radioelectric asymmetric brain stimulation device associated with lithium (REAC-lithium versus previous treatments in subjects with bipolar disorder I or II, evaluated as the number of recurrences compared with the period of illness preceding treatment with REAC-lithium.Methods: The charts of 56 bipolar patients attending our institute were retrospectively evaluated. Treatment with REAC-lithium was administered following the standard Rinaldi-Fontani Institute protocol. Add-on treatments were allowed in the event of manic or depressive recurrence. Eight patients (Group 1 were followed for 30.2 ± 3.0 months, 14 patients (Group 2 were followed for 25.3 ± 3.3 months, 25 patients (Group 3 were followed for 20.3 ± 1.6 months, and nine patients (Group 4 were followed for 16.2 ± 0.5 months.Results: After REAC-lithium treatment, the number of manic and depressive episodes in Group 1 decreased from 2.1 ± 0.6 and 3.0 ± 0.7 to 0.12 ± 0.0 and 0.8 ± 0.4, respectively. In Group 2, the number of manic and depressive episodes decreased from 2.4 ± 0.6 and 3.9 ± 0.7 to 0.14 ± 0.2 and 0.0 ± 0.0, respectively. In Group 3, the number of manic and depressive episodes decreased from 2.6 ± 0.8 and 3.6 ± 0.9 to 0.04 ± 0.0 and 0.0 ± 0.0, respectively. In Group 4, the number of manic and depressive episodes decreased from 2.6 ± 1.1 and 3.7 ± 1.0 to 0.1 ± 0.0 and 0.0 ± 0.0, respectively. All results were statistically significant.Conclusion: REAC showed good efficacy in treating both the manic and depressive phases of bipolar disorder, and in the prevention of recurrences/relapses.Keywords: bipolar disorder, stress, radioelectric asymmetric brain stimulation

  19. Do Coupled Climate Models Correctly SImulate the Upward Branch of the Deept Ocean Global Conveyor?

    Energy Technology Data Exchange (ETDEWEB)

    Sarmiento, Jorge L; Downes, Stephanie; Bianchi, Daniele

    2013-01-17

    The large-scale meridional overturning circulation (MOC) connects the deep ocean, a major reservoir of carbon, to the other components of the climate system and must therefore be accurately represented in Earth System Models. Our project aims to address the specific question of the pathways and mechanisms controlling the upwelling branch of the MOC, a subject of significant disagreement between models and observational syntheses, and among general circulation models. Observations of these pathways are limited, particularly in regions of complex hydrography such as the Southern Ocean. As such, we rely on models to examine theories of the overturning circulation, both physically and biogeochemically. This grant focused on a particular aspect of the meridional overturning circulation (MOC) where there is currently significant disagreement between models and observationally based analyses of the MOC, and amongst general circulation models. In particular, the research focused on addressing the following questions: 1. Where does the deep water that sinks in the polar regions rise to the surface? 2. What processes are responsible for this rise? 3. Do state-of-the-art coupled GCMs capture these processes? Our research had three key components: observational synthesis, model development and model analysis. In this final report we outline the key results from these areas of research for the 2007 to 2012 grant period. The research described here was carried out primarily by graduate student, Daniele Bianchi (now a Postdoc at McGill University, Canada), and Postdoc Stephanie Downes (now a Research Fellow at The Australian national University, Australia). Additional support was provided for programmers Jennifer Simeon as well as Rick Slater.

  20. Number of conveyor belts optimization regarding to its type and logistical parameters in mining industry

    Directory of Open Access Journals (Sweden)

    Dušan Malindžák

    2008-12-01

    Full Text Available Material transportation by belt conveyers is widely used in many industrial branches including mining plants. Belt conveyingdevelopment during the last year was oriented mainly on construction of belts. The consequence of this is the improvement of itsmanufacture qualities bringing down the costs for their exchange and maintenance.Despite the fact that there are some theoreticalcalculations based on a standards it is common in the industry that the belt is not properly selected or it is overdesigned or number of itstypes is too large what can lead to increased costs for its storage. The paper describes the optimization of number of belt types in miningcompany SIDERIT, s. r. o. Nižná Slaná by the method of modernization and unification of belts under practical skills and projectingbased on theoretical calculations.

  1. Coil Opener and Down Ender Operator (iron & steel) 7-88.305; Conveyor Man (iron & steel) 7-88.300; Cooling Conveyor Operator (iron & steel) 7-88.241; Tester Conveyor Operator (iron & steel) 7-88.241; Thread Entry Conveyor Operator (iron & steel) 7-88.241; Yard Transfer Conveyor Operator (iron & steel) 7-88.241--Technical Report on Standardization of the General Aptitude Test Battery.

    Science.gov (United States)

    Manpower Administration (DOL), Washington, DC. U.S. Training and Employment Service.

    The United States Training and Employment Service General Aptitude Test Battery (GATB), first published in 1947, has been included in a continuing program of research to validate the tests against success in many different occupations. The GATB consists of 12 tests which measure nine aptitudes: General Learning Ability; Verbal Aptitude; Numerical…

  2. Development of coating aramid conveyor belt%芳纶输送带贴胶的研制

    Institute of Scientific and Technical Information of China (English)

    曲成东; 安关福; 宋静芳; 蒋成名

    2006-01-01

    研究了芳纶帆布作为输送带骨架材料与橡胶的黏合,通过试验,确定了芳纶作为输送带骨架材料的贴胶配方.间、甲、白体系能够赋予芳纶帆布的层间有较高的黏合强度;混炼工艺--黏合剂的加入时间和温度,对贴胶与芳纶帆布的黏合效果有很大影响.

  3. A note on many-server queueing systems with ordered entry, with an application to conveyor theory

    NARCIS (Netherlands)

    Nawijn, W.M.

    1983-01-01

    Consider a many-server queueing system in which the servers are numbered. If a customer arrives when two or more servers are idle he selects the server with lowest index (this is called the ordered entry selection rule). An explicit expression for the traffic handled by the various servers in a

  4. 双管螺旋喂料机铰刀的制作%Made twin screw feeder worm conveyor

    Institute of Scientific and Technical Information of China (English)

    颜子招

    2001-01-01

    @@ 现在稍大一点的水泥厂维修车间都能制作一些辅助设备,螺旋喂料机便是常见的一种.它的制作中最关键的一步就是铰刀的制作,笔者从事水泥机械辅机的制造和技术工作多年,现将一种简单可行的铰刀制作方法向同行们介绍一下.

  5. Manufacture and installation of screw conveyor%螺旋输送机的制作与安装

    Institute of Scientific and Technical Information of China (English)

    施祥

    2013-01-01

    随着粮油加工行业的不断发展,生产规模的大型化,对螺旋输送机的设计、结构形式与制作也提出了更高的要求,更关注粮食输送的效率.通过介绍螺旋输送机的主要结构、工作原理以及制作安装的要点,以期对设备的发展提供思路.

  6. Hookup lmprovement on Screw Conveyor%螺旋输送机悬挂装置的改进

    Institute of Scientific and Technical Information of China (English)

    郝志东

    2000-01-01

    @@ 1993年以来,我厂的螺旋输送机大部分是从某矿山机械厂整机购进,这种输送机的螺旋节端部装有接头,用十字销钉与螺旋节联接固定,两个接头中间由连接轴相联,在连接轴外有轴套将其与接头固定,吊轴承的瓦衬由黄铜制成,采用油怀润滑,其结构见图1.

  7. Dust drift reduction effect of an air conveyor kit (dual-pipe deflector) mounted on different maize pneumatic drills.

    Science.gov (United States)

    Manzone, Marco; Balsari, Paolo; Marucco, Paolo; Tamagnone, Mario

    2017-03-01

    All maize drills produce a fine dust due to the seed coating abrasions that occur inside the seeding element. The air stream generated by the fan of pneumatic drills - necessary to create a depression in the sowing element of the machine and to guarantee correct seed deposition - can blow away the solid particles detached from the seeds. In order to reduce this phenomenon, a coated maize seeds company (Syngenta®) has set up an ad hoc dual-pipe deflector kit that easily fits different pneumatic drills (also old drills). In this study, the efficiency of this kit and the influence of different drill types on the kit's performance in reducing environmental pollution were evaluated using three different pneumatic seed drill models. The research showed that a dual-pipe deflector installed on a drill in standard configuration did not change the seeder performance, and by using this kit on pneumatic drills, irrespective of their design, it is possible to reduce by up to 69% the amount of dust drift in comparison with the conventional machine set-up. The dual-pipe deflector, under the conditions employed in the present experiments, showed good performance with all types of maize pneumatic drill used. Irrespective of the seeder model on which it is mounted, it is able to obtain similar results, indicating its high operational versatility. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  8. Conveyor Reformation of XW Project Painting Workshop%XW项目涂装车间输送改造

    Institute of Scientific and Technical Information of China (English)

    徐峰; 李婷婷

    2012-01-01

    In order to meet the XW project painting workshop production program and reduce the cost of investment, implementation of XW with XL models share the front supporting ideas, the ultimate guarantee of the same 8 kinds of other models for mixed line production capacity, a series of equipment upgrading of the transportation equipment painting workshop were proceeding and the position of the center of gravity to change the operational risks were discussed.%为满足XW项目涂装车间的生产纲领并减少投资成本,实现XW同XL车型共用前支撑的设想,最终保证同其他8种车型混线生产的能力,对涂装车间进行一系列输送设备改造,并研讨了重心位置改变给生产运行带来的风险。

  9. Application of PLC Technology in Belt Conveyor%PLC技术在带式输送机中的应用

    Institute of Scientific and Technical Information of China (English)

    连明洁

    2016-01-01

    对PLC技术进行了概述,介绍了PLC的特点,从带式输送机在日常生产中的实际控制需要出发设计了主要控制程序的流程图,对PLC技术的应用具有一定的指导意义.

  10. Conveyor belt Production knowledge of Netherlands%荷兰王国输送带生产见闻

    Institute of Scientific and Technical Information of China (English)

    周毅

    2010-01-01

    @@ 受荷兰王国国际交流协会的邀请,作为交流学者,笔者对荷兰进行了为期三个月的访问.由于时间比较充裕,笔者调研了荷兰的社会、经济、文化生活,尤其对输送带生产技术进行了研究.希望与国内同仁共勉.

  11. Urban rivers as conveyors of hydrocarbons to sediments of estuarine areas: source characterization, flow rates and mass accumulation.

    Science.gov (United States)

    Mauad, Cristiane R; Wagener, Angela de L R; Massone, Carlos G; Aniceto, Mayara da S; Lazzari, Letícia; Carreira, Renato S; Farias, Cássia de O

    2015-02-15

    Aliphatic (n-C12-n-C40, unresolved complex mixture, resolved peaks) and aromatic hydrocarbons (46 PAH) were investigated in suspended particulate matter (SPM) sampled over eleven months in six of the major rivers and two channels of the Guanabara Bay Basin. PAH flow rates of the most contaminated rivers, the contribution to the PAH sediment load of the receiving bay, and the main sources of hydrocarbons were determined. PAH (38) ranged from 28 ng L(-1) to 11,514 ng L(-1). Hydrocarbon typology and statistical evaluation demonstrated contribution of distinct sources in different regions and allowed quantification of these contributions. Total flow rate for the five major rivers amounts to 3 t year(-1) and responds for 30% of the total PAH annual input into the northern area of the Guanabara Bay. For the first time PAH mass deposited in the bay sediments has been estimated and shall serve as base for decision making and source abatement.

  12. 29 CFR 1910.107 - Spray finishing using flammable and combustible materials.

    Science.gov (United States)

    2010-07-01

    ... currents toward the exhaust outlet. (2) Interiors. The interior surfaces of spray booths shall be smooth... installed at the upper outer edge of the booth over the opening. (7) Conveyors. Where conveyors are arranged...) Conveyors required. Goods being painted using this process are to be supported on conveyors. The conveyors...

  13. 29 CFR 1910.261 - Pulp, paper, and paperboard mills.

    Science.gov (United States)

    2010-07-01

    ... set, in accordance with paragraph (b)(3) of this section. (ii) Sprockets and chains, gears, and... prevent material from falling on workers. (4) Conveyors. Conveyors and conveyor drive belts and pulleys... conveyor drive belts and pulleys shall be fully enclosed, or if open and within 7 feet of the floor, shall...

  14. Speed control study based on model free adaptive control of belt conveyor%基于MFAC的带式输送机速度控制研究

    Institute of Scientific and Technical Information of China (English)

    胡伟; 李小娟

    2014-01-01

    传统的带式输送机多采用PID控制,而带式输送机在运行过程中由于负载和环境参数的变化而呈现不确定性;同时,电机速度过程本身具有非线性,所以难以辨识其动态过程的模型参数并构建系统的数学模型,传统的方法不能达到理想的控制效果.提出采用无模型自适应控制(MFAC)方法对带式输送机从启动到稳定运行,以及加载后的整个运行状态进行追踪控制.结果证明,与PID相比该方法追踪效果较好,同时误差波动较小.

  15. 带式输送机设计软件系统设计及实现%Design and realization for software system of belt conveyor

    Institute of Scientific and Technical Information of China (English)

    高英; 韩刚

    2009-01-01

    以功能强大的Visual Basic为工具,将Access数据库和ADO数据库编程技术应用于带式输送机系统的设计,开发了基于CEMA标准的带式输送机设计系统.系统采用模块化结构,由数据库模块、设计选型模块、结果输出模块组成.能够实现原始参数输入、设计计算、部件选型、自动生成设计说明书和绘制线路图,对于减轻技术人员的劳动强度,加快开发速度,缩短设计周期具有现实意义.

  16. Research on Computer Aided Design to Belt Conveyor%大型带式输送机的计算机辅助设计

    Institute of Scientific and Technical Information of China (English)

    何青; 居敬杰; 董大仟; 贾兰辉

    2006-01-01

    将计算机辅助设计技术应用于大型带式输送机系统的设计,开发了基于CEMA标准的大型带式输送机设计系统.系统采用面向对象的软件开发技术,依据最新的CEMA标准设计流程,应用可视化动态图形组件技术和数据库技术,具有动态图形化输送机侧形设计和建模,以及强大的部件数据库及其库管理等功能,能够进行输送机关键部件的优化选型和参数分析、可视化计算和校核.

  17. Design of long slope-down belt conveyor%大型下运带式输送机的设计

    Institute of Scientific and Technical Information of China (English)

    黄源红; 何青; 武建伟; 董大仟

    2008-01-01

    研究了基于CEMA标准的变坡下运带式输送机的分析理论和设计方法,对大型变坡下运带式输送机的各种驱动布置方式及其不同工况下的输送带张力的计算流程进行了分析讨论.算例分析表明,采用CEMA标准进行大型变坡下运带式输送机的设计,在确保安全的前提下具有显著的经济性.

  18. The North Atlantic anthropogenic carbon conveyor: temporal variability of within-ocean transports and their sensitivity to the meridional overturning circulation

    Science.gov (United States)

    Brown, Peter; McDonagh, Elaine; Sanders, Richard; King, Brian; Smeed, David; Watson, Andrew; Schuster, Ute; Baringer, Molly; Wanninkhof, Rik; Meinen, Chris

    2016-04-01

    The North Atlantic plays a critical role in the global carbon cycle both as a region of substantial air-sea carbon dioxide uptake and as a location for the transfer of CO2 to depth on climatically-important timescales. However, while surface flux variability is relatively well constrained, our understanding of the changing deep carbon distribution is restricted to sub-decadal repeat hydrographic sections, and for anthropogenic carbon (Canth), integrated multi-decadal basin-scale estimates. Here, we present the first observation-derived high-resolution estimate of short-term meridional carbon transport variability and long-term trends across the subtropical North Atlantic. Historical hydrographic data-based estimates of Canth are used to generate predictive regressions that, combined with RAPID mooring and ARGO float-derived transport estimates, create a 10-day frequency interior ocean carbon flux time-series for 2004-2012. The mean net Canth transport across this timeframe is found to be relatively independent of calculation method and robust at 0.18 PgC yr-1 northwards, with poleward advection of high Canthshallow waters outweighing the predominantly southwards transports of low concentrations at depth. Substantial seasonal, sub-annual and interannual transport variability is observed that is highly sensitive to the strength of the overturning circulation. While the recently identified multi-year decrease in MOC strength similarly impacts Canth transports, its full effect is masked by the northwards transport of increasing surface Canth levels. A comparison with historical estimates of the regional carbon sink reveals an intrinsic relationship between air-sea uptake, ocean transport and heat fluxes, which will become more important as the ocean responds to a changing global climate.

  19. Dissolved aluminium in the ocean conveyor of the West Atlantic Ocean : Effects of the biological cycle, scavenging, sediment resuspension and hydrography

    NARCIS (Netherlands)

    Middag, R.; van Hulten, M. M. P.; Van Aken, H. M.; Rijkenberg, M. J. A.; Gerringa, L. J. A.; Laan, P.; de Baar, H. J. W.

    2015-01-01

    The concentrations of dissolved aluminium (dissolved Al) were studied along the West Atlantic GEOTRACES GA02 transect from 64 degrees N to 50 degrees S. Concentrations ranged from similar to 0.5 nmol kg(-1) in the high latitude surface waters to similar to 48 nmol kg(-1) in surface waters around 25

  20. 无吊挂轴承螺旋输送机的设计%Design for screw conveyor without suspended bearing

    Institute of Scientific and Technical Information of China (English)

    崔丽娟

    2005-01-01

    介绍了传统的螺旋输送机的主要设计指标,指出了传统输送机中吊挂轴承导致的一系列设计及工作中的弊端.针对该设计缺陷,详细分析了传统输送机的受力情况,并根据力学模型提出了解决的办法,给出了全新的设计方案.

  1. 球磨机螺旋输送器轴承座外移改造%Out - moving transformation of bearing pedestal of ball mill screw conveyor

    Institute of Scientific and Technical Information of China (English)

    邓代兴

    2010-01-01

    国电安顺发电有限公司一、二期共4×300MW机组,总装机1200MW,1998-2001年相续投产,为贵州首座超百万机组发电厂.结合我公司球磨机设备情况,分析了球磨机螺旋输送器轴承长期高温运行,对机组安全经济运行的影响,针对目前的情况我们提出了具体的解决方案与大家交流.

  2. Failure Analysis of the Spring Fracture of Flexible Screw Conveyors%柔性螺旋输送机弹簧断裂的故障分析

    Institute of Scientific and Technical Information of China (English)

    张智慧

    2009-01-01

    采用柔性螺旋输送机实现特殊生产环境下两个空间点之间的物料倾角输送,并分析挠性螺旋体(弹簧)容易断裂的原因,通过更换弹簧材料和形式来提高弹簧承受扭剪应力的能力,解决了弹簧断裂的问题.

  3. 垂直螺旋卸船机喂料头的研究%Research on the Intake Machine of the Vertical Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    王细平; 孟文俊

    2006-01-01

    在垂直螺旋卸船机设计中,喂料头的设计至关重要,设计一个好的喂料头能大大增加垂直螺旋输送量.根据反复实物实验,阐述了喂料头转速和喂料头螺距的关系以及喂料头设计时各个参数的设定、螺旋叶片的绘制等.

  4. 硫磺喂料螺旋输送机轴端密封改造%Mondification of Axial Seal of Screw Conveyor for Sulfur

    Institute of Scientific and Technical Information of China (English)

    马凤坤; 吴昊

    2013-01-01

    The seal structure selection for conveying device in the condition of lots of dust was introduced briefly through the modification of screw conveyer for sulfur. The value of old packing seal device to modern production is also introduced.%通过对硫磺喂料螺旋输送机的改造,简要介绍有大量粉尘工况的输送装置密封结构选择,介绍古老的填料密封装置在现代生产中的价值.

  5. A Study on the Critical Revolution of Vertical Screw Conveyor%立式螺旋输送机临界转速的探讨

    Institute of Scientific and Technical Information of China (English)

    陈松; 黄浩堂

    2000-01-01

    对立式螺旋输送机临界转速传统的计算方法提出异议,对立式螺旋输送机物料运动状态,受力分析进行探讨,建立了新的临界转速计算公式,并对新老公式进行了实例验算、比较.

  6. 主动铰接式盾构螺旋输送机装配工艺分析%Analysis of active articulated shield screw conveyor assembly process

    Institute of Scientific and Technical Information of China (English)

    关振华

    2014-01-01

    针对动铰接式土压平衡盾构,主机装配过程中螺旋输送机装配出现的问题,对原有螺旋输送机装配工艺进行分析,找出无法顺利完成装配工作的问题所在,提出可行性技术修改方案,降低螺旋输送机装配难度,增加工作效率,避免安全隐患。

  7. 新型垂直螺旋输送机的开发应用%Development and Application of New Vertical Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    粱晓方

    2003-01-01

    @@ 常用的垂直输送设备有斗式提升机、垂直型埋刮板输送机、垂直螺旋输送机等.这些设备在输送如糖、麦芽粉、食品添加剂等物料时,能否保证其洁净、不受污染,一直是一个没有解决的问题.

  8. Making of Vane of Screw Shaft of Screw Conveyor%螺旋运输机螺旋轴叶片的制做

    Institute of Scientific and Technical Information of China (English)

    彭燕

    2000-01-01

    @@1 引言 螺旋运输机属于不具有挠性牵引构件的输送机械,它可以水平及倾斜方向或垂直向上输送物料,并在输送物料的同时完成混合和冷却等作业·其结构简单紧凑、工作可靠、易维修、成本低廉,另外,因为料槽是封闭的,所以便于输送易飞扬的、炽热的及气味强烈的物料,可减少对环境的污染·因此,螺旋运输机被广泛应用于粮食工业、建筑材料工业、化学工业、机械制造业、交通运输业等行业中·

  9. 土压平衡盾构伸缩螺旋机的设计%Design of earth pressure balance shield telescopic screw conveyor

    Institute of Scientific and Technical Information of China (English)

    洪秋华

    2011-01-01

    阐述了土压平衡盾构螺旋机的一种新型设计思路,提出了带导向柱油缸及双闸门系统的伸缩式螺旋机,提供了满足其推进要求所必须的参数,为盾构伸缩式螺旋机的实际应用提供了理论依据.

  10. 螺旋输送机设计参数选择%How to select the design parameters of screw conveyor for brick and tile industry

    Institute of Scientific and Technical Information of China (English)

    徐余伟

    2008-01-01

    介绍了制砖用螺旋输送机的工作机理,分析了螺旋输送机的主要参数对其使用性能和输送能力的影响,阐明了螺旋输送机各设计参数的选择和确定原则及方法.

  11. 螺旋输送机动力及有限元疲劳分析%Dynamic and Finite Element Fatigue Analysis on Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    杨非; 赵磊

    2014-01-01

    介绍了螺旋输送机的原理,论述了其在选型和设计中转速、螺距和电机功率的选择方法以及应注意的问题,并使用Solidworks Simulation对其在工作条件下的疲劳强度进行了有限元仿真.

  12. The Design for Increasing Service Life of the Screw Conveyor%有效延长螺旋输送机使用寿命的设计

    Institute of Scientific and Technical Information of China (English)

    吴淑芳

    2009-01-01

    通过对现行螺旋输送机在使用过程中出现的故障进行分析和研究,找出了其根本原因是密封设计的不合理.为了提高螺旋输送机的使用寿命,介绍了一种切实可行的密封措施.

  13. Amelioration Design of Supporting Mechanism of Screw Conveyor%螺旋输送机支承装置的改进设计

    Institute of Scientific and Technical Information of China (English)

    郭立观; 郑晖

    2009-01-01

    针对悬挂装置在输送机运行过程中出现的问题,对悬挂装置进行改进,设计出一种新型悬挂支承装置,从理论上解决了悬挂装置引起的螺旋轴径向振动、润滑条件差、不易维修、物料输送效率低等问题.

  14. Application of SVG in Power Supply System of Port Belt Conveyor%港口皮带机系统SVG动态补偿方案

    Institute of Scientific and Technical Information of China (English)

    孙中旺; 靳立开

    2013-01-01

    Frequency converter devices are widely used to port bulk system to improve the reliability and efficiency. It greatly improves the power factor of equipment, reduces the line loss and voltage drop and the demand for voltage regulation device. But the usage of power electronic converter causes that the system is very sensitive to power quality, harmonic content is over-proof and directly, which affect the normal operation and use of the equipment. In order to better solve the harmonic produced by a large number of electronic current transformer equipment, improve power quality, based on Huanghua Port Phase III Pro-ject, of which the SVG is extensively used on equipment in 6 kV substation. Through the reactive power and harmonic com-pensation, harmonic can reduce reactive power loss and avoid a bigger loss, and improve the utilization rate of electrical e-quipment to improve the injection equipment per unit time of active power, the efficiency is greatly increased and the energy saving effect is remarkable.%港口散货系统为提高系统的可靠性和效率而广泛使用电力电子变流器。这虽然大大提高了设备的功率因数,降低了线路损耗和电压降落,减少了对电压调节设备的需求。但是大量电力电子变流器的使用,导致系统电能质量非常敏感,谐波含量超标,直接影响了设备的正常运行和使用。为了更好地解决大量电子变流设备所产生的谐波,提高电能质量,以三期工程为背景在6 kV变电所内大量使用了SVG设备,通过无功及谐波补偿,不仅减少无功损耗,避免谐波造成更大损耗,还可以提高电气设备利用率,提高单位时间内注入设备的有功功率,工作效率大大提高,节能降耗的效果显著。

  15. Design of network-controlled system on car-painting conveyor line%轿车涂装输送线控制网络设计

    Institute of Scientific and Technical Information of China (English)

    聂宗瑶; 陈彬; 朱正国; 张磊

    2015-01-01

    在分析轿车生产工艺的基础上,按照轿车生产的主流技术,采用地面式机械化输送模式对传统的轿车生产中涂装输送系统进行网络化控制设计。网络化控制系统采用分散控制、集中管理的主从网络控制模式,以西门子S7‐300PLC作为主(操作)站和远程ET200S作为从(操作)站实现系统控制功能;并通过人机界面实现操作人员的在线状态查询和故障查询;涂装设备的控制都具备手动、自动模式切换和故障报警指示。该系统提高了轿车涂装工艺过程的自动化水平,提升了产品质量,降低了制造成本。%Based on the analysis of the car production process ,according to the mainstream of car production technology ,we use ground mechanical transmission mode of traditional painting conveying system in the car production of the network‐controlled design .Network‐controlled system adopts the distributed control‐centralized management mode of master‐slave network control ,which is based on Siemens S7‐300 PLC as the main station (operations ) , remote ET200S as from (operation ) stand to realize system control function . And through the man‐machine interface (HMI ) , operators implemente online status query and fault query . Car‐painting equipment is controlled with both manual and automatic mode of switch and fault alarm instructions .T he above method improves the automation level of the car coating process and the product quality and reduces the manufacturing cost .

  16. Kinematic analysis of U-type slide conveyor based on MATLAB%基于MATLAB的U型滑道输送链运动学分析

    Institute of Scientific and Technical Information of China (English)

    李英杰; 洪林; 尹瑞华

    2015-01-01

    针对一种特殊工况下的低速重载输送链———U型滑道约束输送链,分析了主动链轮运动一个周期的时间内,链节在主从动链轮啮合区域及位置补偿区域内的运动状态。根据闭环矢量法建立机构的位移矢量方程,采用MATLAB软件对机构进行运动学分析,得出各部分机构的运动曲线。运动学分析的结果为U型输送链的动力学分析及速度补偿奠定有利的基础。%For a special kind of slow-speed overloading transmission chain-U-type slide constrained chain , this paper analyses motion of link into active chain sprocket engagement area , position compensation area , and leav-ing active chain sprocket engagement area in a cycle motion process of active chain sprocket .The displacement vector equation of the mechanism is established by closed-loop vector method .Using MATLAB software to ana-lyze the kinematic of mechanism and draw the kinematic curve of each component part .The result of kinematic analysis provides powerful basis and reference for the kinetic analysis and speed compensation of U -type slide constrained chain .

  17. 带式输送机转载溜槽试验设计研究%Research on experiment design for transfer chute of the belt conveyor

    Institute of Scientific and Technical Information of China (English)

    朴香兰

    2014-01-01

    In order to select proper parameters of transfer chute and reduce the wear amount between the material and boundary of chute as ensuring material flow unblocked , this paper analyzed material movement and built the flow model of material in the transfer chute .An experimental design was carried out for the related parameters of the chute based on design theory and the better optimal scheme was obtained using the intuitive analysis methods .The results show that the number of dimensionless wear is the least when the radius is 5 .5m ,the entrance angle is 18° ,the height is 3m and the outlet angle is 33° among the any combination of chute of the arc and the straight sections .%为了合理选择转载溜槽的几何参数,保证料流的.通同时降低物料与边界的磨损量,对转运溜槽中的物料运动进行了分析,建立了物料在转载溜槽中的流动模型。根据试验设计理论对溜槽的相关参数进行了试验设计,利用直观分析法获得了较优方案。结果表明:直线段和圆弧段的任意组合溜槽中,当圆弧半径5.5m、入口角度18°、总高度3m和出口角度33°时,无量纲磨损数最小。

  18. Shallow Talk the Design of Belt Conveyor Feeding Chute%浅谈带式输送机给料溜槽的设计

    Institute of Scientific and Technical Information of China (English)

    李慧

    2015-01-01

    多样化、合理化、人性化是溜槽设计的关键,设计中及时采用新技术、新材料,能为企业创造良好的生产和工作环境。结合多年从事机制专业的相关工作经验,从溜槽倾角、降噪和防磨损等方面分析了溜槽设计时应注意的问题。%Diversification, rationalization, humanization is the key to the chute design, design the timely adoption of new technologies, new materials, for the enterprise to create a good production and working environment. Unifies many years to be engaged in the mechanism of professional work experience, from the chute inclination, noise reduction and anti-wear aspects analyzes the chute design should pay attention to the problem.

  19. Improvement on MRH-S100-41 Type Scraper Conveyor%MRH-S100-41型刮板运输机的改进

    Institute of Scientific and Technical Information of China (English)

    于志萍

    2010-01-01

    介绍了MRH-S100-41型掘进机运输机减速器系统的改造方法,论述了改造后减速器系统的功用及优点,以及推广应用效果.使用数据对比的方法说明了改造后的优越性.

  20. 75 FR 81165 - Examinations of Work Areas in Underground Coal Mines for Violations of Mandatory Health or Safety...

    Science.gov (United States)

    2010-12-27

    ... quickly deteriorate and fall; stoppings can crush out and short-circuit air currents; conveyor belts can... materials and a misaligned conveyor belt, an operator might not consider these to be hazardous conditions... removed from service immediately. Sec. 75.1731(a). Damaged rollers, or other damaged belt conveyor...

  1. 30 CFR 77.400 - Mechanical equipment guards.

    Science.gov (United States)

    2010-07-01

    ... Safeguards for Mechanical Equipment § 77.400 Mechanical equipment guards. (a) Gears; sprockets; chains; drive, head, tail, and takeup pulleys; flywheels; couplings; shafts; sawblades; fan inlets; and similar... hazardous to persons below. (c) Guards at conveyor-drive, conveyor-head, and conveyor-tail pulleys shall...

  2. 托辊间距的选择对带式输送机功率的影响%Effects of Idler Spacing Selection on Belt Conveyor Power Consumption

    Institute of Scientific and Technical Information of China (English)

    董大仟; 何青

    2008-01-01

    讨论了带式输送机托辊间距的选择对功率消耗的影响.采用CEMA标准,使用典型的三辊槽形承载托辊和两辊V形回程托辊,对某大型带式输送机(6 000 t/h, 8.9 km, 5.6 m/s)选择相同的带速,计算并比较了不同的托辊间距对输送带张力和功率消耗的影响,为大型带式输送机的优化设计提供参考.

  3. 带式输送机功率计算方法及其工程应用问题的研究%Research on power calculation method for belt conveyor and its problems in project application

    Institute of Scientific and Technical Information of China (English)

    宋伟刚; 姜涛

    2008-01-01

    通过CEMA带式输送机功率和张力计算方法与德国标准DIN22101计算方法的比较分析,明确了CEMA方法的特点,以Visual Basic 6.0为开发工具开发了CEMA计算方法的带式输送机功率张力计算软件,通过实例和工程应用验证了软件的正确性.通过研究CEMA算法中弯曲阻力系数Ky和DIN22101标准中模拟摩擦系数f的关系,得出CEMA算法主要阻力的规律;给出了设定模拟摩擦系数修正功能,采用温度校正系数的修正技巧使软件能够按输入的模拟摩擦系数进行功率和张力计算,扩展了软件的功能.针对应用DIN22101标准时没有与温度相关的修正方法,利用CEMA算法得出模拟摩擦系数在低温情况下的修正值.

  4. Study of the relationship between the load and indentation resistance of the conveyor belt%带式输送机橡胶挤压阻力与载荷的关系研究

    Institute of Scientific and Technical Information of China (English)

    柴畅; 许朝华

    2009-01-01

    以Winkler假设为基础的橡胶输送带挤压模型被广泛接受,其中的Jonkers模型于2005年被收入美国CEMA第6版设计标准.但是,这类模型是近似模型,由于缺乏精确解,至今没有文献来验证这类近似模型的近似程度.本文将边界元方法应用于验证Jonkers模型.发现以Winkler假设为基础的橡胶输送带挤压模型有很大误差,这类模型必须经过修正才能应用.文中给出了修正方法及修正后结果.

  5. Enhancing the energy efficiency of elevators and conveyor systems by the development of a novel frequency converter; Verbesserung der Energieeffizienz von Aufzuegen und Foerderanlagen durch Entwicklung eines neuartigen Frequenzumformers - Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Kanyo, P.; Bolla, M.

    2008-07-01

    This final report for the Swiss Federal Office of Energy (SFOE) reports on work done concerning the development of a new type of frequency converter for drive applications. The converter is free of the disadvantages incurred when using voltage converters, where it is difficult to reduce standby power consumption since much energy is stored in the intermediate circuit condensers. The new current converter completely provides the desired advantages (recuperation, standby). In addition, it is suited to industrial applications with costs that are comparable to or lower than the systems used today. The report discusses the technical solution chosen, its applications and the costs involved. Prototypes are described and the results of measurements made are discussed.

  6. Application of Frequency Control of Motor Speed in DFS4005 Slat Conveyors%变频调速在DFS4005板式输送线中的应用

    Institute of Scientific and Technical Information of China (English)

    黄敏

    2001-01-01

    本文针对柴油机油漆后在板式输送线上进行飞轮、起动电机等装箱工作,阐述了采用交流变频调速后节省调速时间,加、减速性能好,并具较高的稳速精度,在专用设备的设计中是值得推广的一种调速方法.

  7. 带式输送机托辊管体与轴承座的有限元分析%Finite Element Analysis for Idlers Pipe and Bearing Seat of Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    带式输送机托辊管体和轴承座的受力变形,会引起输送带上下颤动和输送机的振动稳定性.应用Solidworks Simulation软件,对KTⅡ108、KTⅡ133、KTⅡ159的3种轴承座及其管体进行应力和变形分析,结果表明:KTⅡ133轴承座变形小,最大应力小,与其配合的管体变形也小.分析结论对托辊的结构设计提供了理论依据.

  8. Design and Modification for the Water-colded System of Transport Roller Conveyor in Walking Reheating Furnace%步进式加热炉内水冷辊道的设计改造

    Institute of Scientific and Technical Information of China (English)

    罗喜泽

    2003-01-01

    阐述了步进炉内输入输出辊道的作用,对辊道改造前存在的问题分析,介绍了对其辊轴装置,传动装置,减速装置,支承装置,冷却水装置改造设计,并对改造前后辊道进行优化分析,通过实际运行,改造效果良好.

  9. 慢速螺旋输送机支承轴承选择与改进%Improvement and selection of the bearing of low-speed conveyor screw

    Institute of Scientific and Technical Information of China (English)

    李近人

    2000-01-01

    @@ 螺旋输送机又称绞龙.因具有结构简单,横截面积小,密封性能好,可多点进料和卸料,操作安全方便及制造成本低等优点而被广泛应用.其缺点是:机件磨损较重,输送量较低,与皮带输送机及斗式提升机相比动力消耗较大,在物料输送过程中容易造成残留和破碎现象,当物料有机杂质含量大时,易引起堵塞事故.

  10. The Regular Problems and Improvements of The Screw Conveyor During Transporting MgCl2%氯化镁螺旋输送机常见故障及改进

    Institute of Scientific and Technical Information of China (English)

    陈洪霞

    2007-01-01

    螺旋输送机可以水平及倾斜方向输送物料,但在氯化镁生产过程中经常出现轴承磨损严重、物料溢出等问题.文章分析了螺旋输送机出现故障的原因,并提出了可行的改进方案.

  11. Screw Majorization Design of a Kind of Loose Grain Screw Conveyor%一种散粮螺旋输送机螺旋体的优化设计

    Institute of Scientific and Technical Information of China (English)

    屈少敏

    2000-01-01

    在一种输送散粮的螺旋输送机的螺旋体的设计中,对于其错综复杂、相互影响的各性能参数和尺寸参数的理论分析,建立优化设计数学模型,用优化设计方法进行设计计算,从而使之具有最佳的结构尺寸和最优的性能.

  12. 管螺旋输送机料口展开下料软件的开发与应用%Development and Application of Feed Inlet or Feed Opening Spread Laying-off Software of Tubular Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    谈炳发; 黄建辉; 刘合荣; 张福全

    2000-01-01

    简述了管螺旋输送机料口展开下料软件开发的基本方法,实现了对AutoCAD的二次开发,编制了管螺旋输送机料口展开下料的程序模块,例举了实例及软件应用的结果.

  13. Influence of parameters of screw conveyor on its strength and deformation%螺旋离心机输送器参数对其强度与变形的影响研究

    Institute of Scientific and Technical Information of China (English)

    傅彩明; 周知进

    2006-01-01

    在诸多参数中,对螺旋离心输送器主要参数:转速、叶片厚、半锥角和导程对其强度和变形的影响进行了分析研究,为已有的卧式螺旋离心机的改造优化和实际应用提供了依据.

  14. 磷石膏双螺旋输送机的性能和技术改造%The performance of twin screw conveyor for phosphogypsum and its modification

    Institute of Scientific and Technical Information of China (English)

    邢爱新

    2006-01-01

    由于S-NPK装置扩能,使磷酸生产的副产品磷石膏增加,致使输送磷石膏的双螺旋输送机常发生故障.该文对该厂双螺旋输送机的输送能力及所需功率进行了核算,并介绍螺旋旋芯磨损严重、螺旋轴弯曲、串轴等故障进行技改的情况.

  15. PTA螺旋输送机主轴断裂事故分析及改造%Cause analysis of and improvement to cracked main shaft of PTA screw conveyor

    Institute of Scientific and Technical Information of China (English)

    靳兆文; 潘传九

    2007-01-01

    对某化工厂因生产负荷增加而造成的螺旋输送机主轴断裂事故进行了分析,并对其做了适当改造,利用ANSYS有限元软件对改造后的主轴进行应力分析,并对其制造和检验提出要求.

  16. 磨煤干燥装置气力输送系统与螺旋输送机的对比%Comparation of the pneumatic onveying system and screw conveyor of Coal Mill of Coal Milling and Drying unit

    Institute of Scientific and Technical Information of China (English)

    弥勇

    2016-01-01

    磨煤干燥装置中,最终制备出来的合格煤粉产品输送到气化装置.目前国内普遍采用的方式为螺旋输送机或者气力输送系统,本文针对两种煤粉输送方式进行了对比.

  17. 橡胶工业螺旋输送机设计参数的选择和确定%The choice and decision of design parameters for screw conveyor for rubber industry

    Institute of Scientific and Technical Information of China (English)

    徐余伟

    2008-01-01

    介绍了橡胶工业螺旋输送机的工作机理,分析了螺旋输送机的主要参数对其使用性能和输送能力的影响,阐明了螺旋输送机各设计参数的选择和确定原则及方法.

  18. 螺旋输送机螺旋体的有限元分析与优化设计%FEA and Optimization Design of Screw of Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    王铁流; 郭晓梅; 张青娥; 蔡杨

    2012-01-01

    以Pro/Engineer软件应用为例,建立螺旋输送机螺旋体的三维实体模型,通过有限元分析研究螺旋体主要结构尺寸对其强度和刚度影响的敏感性,并进行优化,为实现螺旋体的优化设计提供了一种有效的方法.

  19. 螺旋输送机螺旋管滑块式连接的设计计算%Design and calculation of slide-block connection between screw pipes of screw conveyor

    Institute of Scientific and Technical Information of China (English)

    李正峰; 仲巍

    2009-01-01

    分析了螺旋输送机螺旋管常用连接形式的优缺点,运用弹性力学的理论,对近年出现的滑块式连接进行等强度和等刚度的计算,从而合理确定了截面尺寸.根据挤压强度验算了轴的承载能力,证明这种连接能满足工程上的强度要求.

  20. 基于GAAA算法的螺旋钻采煤机输送机构参数的优化%Parameter optimization of spiral conveyor for coal auger based on GAAA algorithm

    Institute of Scientific and Technical Information of China (English)

    李晓豁; 林其岳; 何洋

    2010-01-01

    为改善螺旋钻采煤机的输送性能,提高其输送效率,以螺旋输送机构的内径、螺距、螺旋升角、中心杆的强度以及转速为设计变量,选择输送机构的输煤生产率最大和能耗最低作为优化目标,采用遗传算法和蚂蚁算法的混合算法(GAAA算法)对螺旋输送机构进行参数优化.优化结果表明,在输送机构外径和螺旋叶片厚度保持不变的情况下,在保证结构强度与刚度要求和不发生堵塞等条件下,螺旋钻采煤机的输煤生产率提高了23.17%,输送效率提高了12.93%.

  1. Analysis on Soil Discharging Control of Auger Conveyor on Soil Pressure Balancing Shield%土压平衡盾构螺旋输送机排土控制分析

    Institute of Scientific and Technical Information of China (English)

    胡国良; 胡绍华; 龚国芳; 杨华勇

    2008-01-01

    土压平衡盾构是一种专用于软土地下隧道工程开挖的技术密集型重大工程装备.螺旋输送机是土压平衡盾构的重要组成部分,它主要用来从盾构密封仓内将刀盘切削下来的泥土排出盾体,同时保持密封仓内土压力,维持开挖面土体的稳定.介绍了土压平衡盾构螺旋输送机的工作原理,设计了一种采用比例反馈控制及蓄能器补油的盾构螺旋输送机液压系统.对盾构螺旋输送机的排土控制策略作了详细介绍,采用自整定PID控制技术实现了螺旋输送机的自动排土控制,并在盾构模拟试验台上进行相关试验分析研究.由试验结果可知,在保持刀盘转速及推进速度不变的情况下,通过对密封仓内土压力的实时反馈来控制螺旋输送机转速,可将其土压力控制在设定的范围内,使得密封仓内排土量基本稳定,从而达到控制地表沉降的目的.相关结论可为土压平衡盾构实际施工提供理论参考.

  2. Implement of a Large-scale Belt Conveyor HARRISON-start with 6RA70%大型带式输送机HARRISON起动6RA70的实现

    Institute of Scientific and Technical Information of China (English)

    丁黎梅; 张海; 高磊鸿; 杨津听; 蔡莲如

    2006-01-01

    介绍了大型胶带机理想的HARRISON起动方式以及HARRISON起动方式的数学模型,介绍了高性能的6RA70全数字直流调速装置,并利用其内嵌的数学运算模块实现了HARRISON起动,详细阐述了HARRISON起动的实现原理.

  3. Reliability calculation and design of safety pins for scraper conveyor%刮板输送机用安全销的可靠性计算与设计

    Institute of Scientific and Technical Information of China (English)

    李正峰

    2004-01-01

    为了使摆线针轮减速电机在过载时免受损坏,刮板输送机通常采用安全销作为保护装置。安全销保护装置结构如图1所示,主要包括轴套、安全销、销套等。轴套结构如图2所示,如果功率比较小,也可只开1个孔,用单根销。安全销结构如图3所示。其工作原理如下:轴套与主轴用平键联

  4. Reasoning Process of Product Platform Design for Armored Face Conveyor Based on Sensitivity Analysis%基于敏感性分析的刮板输送机产品平台设计推理

    Institute of Scientific and Technical Information of China (English)

    赵文燕; 张换高; 何桢; 檀润华; 李国平

    2009-01-01

    在分析现有产品平台设计方法基础上,提出一种基于敏感性分析的平台推理方法:通过分析导致产品变型的因素的可控性,排除当前产品中不合理的变型;通过分析产品结构模型元素对产品能力因素的敏感性,确定层级平台主参数;通过分析每个功能模块对变型因素的敏感性,并结合一定的平台表达方式确定平台架构.推理过程采用质量管理QC工具中的鱼骨图来分析产品变型因素,利用反向鱼骨图表达产品及产品平台的架构.该方法可以推广到参数范围变化较大的相似产品的平台设计.%After a reference review of AFC, a method of reasoning process of product platform design based on sensitivity analysis was put forward: some illogical or unnecessary change in design can be filtered after controllable analysis of causes was finished;main parameters of hierarchy platform were identified based on a sensitivity analysis between parameters associated to functional ability and modules or components; platform architecture was advanced with some manners by analyzing sensitivity of function elements to uncontrollable causes. A tool of quality control-fishbone diagram was introduced to find out the causes of the product changes, reverse fishbone diagram was used to represent the architecture of the product and platform. The method and process of product platform design based on sensitivity analysis is feasible to be applied to the platform design of other products with similar structure.

  5. Optimization by simulation and development of solar cells with aluminium paste rear emitter and diffusion in conveyor furnace; Otimizacao por simulacao e desenvolvimento de celulas solares com emissor posterior formado por pasta de aluminio e difusao em forno de esteira

    Energy Technology Data Exchange (ETDEWEB)

    Mallmann, Ana Paula

    2011-01-15

    Photovoltaic solar energy is the direct conversion of solar energy into electricity and it has low impact to the environment during electric energy production. The main device of this technology is the solar cell and silicon is the substrate most used. The solar cells are electrically connected and encapsulated in order to form the photovoltaic module. The aims of this thesis are to optimize, develop and to analyse n{sup +}np{sup +} solar cells processed in n type Si-PV-FZ and with aluminum rear emitter formed in belt furnace. The optimization of solar cells by simulation is an important step before the device development. The software PC-1D and another program developed using Visual Basic language were used. Considering a metal grid formed by evaporation technique in vacuum ambient an efficiency of 16.8 % may be achieved. With screen printed grid, 15.8 % efficient solar cells were obtained. From the simulation results it was found that the screen printing metallization may become more viable than evaporation technique because there is low difference in the efficiency and the screen printing is a simpler technique. The experimental optimization of silicon wafers texture process resulted in reflectance of 12 %. This value is typical for monocrystalline silicon with textured surface. Experimental optimization of phosphorus front surface field shows a sheet resistance of (36 {+-} 4) {omega}/ for this region. This region was formed in a thermal step in a conventional furnace with POCl{sub 3}. It was found that after the phosphorus diffusion occurred gettering to specific temperature and time. It was verified that the minority carrier lifetime in the final of processing is similar to the initial value. The influence of steps sequence of front silver paste firing and rear diffusion/firing aluminium paste, of surface passivation and the influence of dry air flow during the aluminium paste diffusion/firing, of aluminium paste diffusion/firing temperature and of belt speed under the fabricated devices electric characteristics were analysed. The aluminum rear emitter n{sup +}np{sup +} silicon solar cells resulted in 29 efficiency up to 9,5 %. The best solar cells were processed under 900 deg C to aluminium paste diffusion/firing and belt speed of 140 cm/min. The efficiency is limited by low values of V{sub OC} and FF reached. It was also verified that the local rear emitter formation results in solar cells with higher efficiency than those with homogeneous emitter. (author)

  6. Analytical Method of Designing and Selecting Take-Up Systems for Mining Belt Conveyors / Analityczna Metoda Projektowania i Doboru UKŁADÓW Napinania Dla GÓRNICZYCH PRZENOŚNIKÓW TAŚMOWYCH

    Science.gov (United States)

    Kulinowski, Piotr

    2013-12-01

    This article presents a method developed to design and select tensioning systems which makes use of standard calculations. It describes procedures for selecting and analysing the operation of devices tensioning the belt, which procedures are based on the static characteristics of these devices, and a proposal for introducing a substitute belt elasticity modulus that would make the calculations of the tensioning stroke length account for the value of the initial force tensioning the belt and for its sag between sets of idlers. Static characteristics of tensioning systems have been used to describe their operation and present the advantages and disadvantages of individual design solutions W artykule przedstawiono opracowaną metodę projektowania i doboru układów napinania taśmy wykorzystującą stosowane standardowe procedury obliczeniowe uzupełnione o zależności analityczne uwzględniające zwis taśmy między zestawami krążnikowymi i charakterystyki statyczne urządzeń napinających taśmę. W pierwszej części publikacji opisano analityczną metodę doboru układu napinania taśmy bazującą na wynikach obliczeń sił w taśmie i szacunkowych kalkulacjach drogi napinania taśmy stosowanych obecnie w standardowych procedurach obliczeniowych (Golka i in., 2007; Gładysiewicz, 2003; Żur i Hardygóra, 1996). Następnie przedstawiono propozycję uzupełnienia stosowanej metody analitycznej o wprowadzenie diagramu drogi napinania i uwzględnienie zastępczego modułu sprężystości taśmy (Kulinowski, 2012). W obliczeniach standardowych przyjmuje się, że długość odcinka taśmy pomiędzy zestawami krążnikowymi jest równa ich rozstawowi. W rzeczywistych warunkach może się zdarzyć, że na niektórych odcinkach złożonego profilu trasy przenośnika wartość zwisu taśmy przekracza wartości dopuszczalne, wtedy długość taśmy między zestawami krążnikowymi jest znacząco większa od rozstawu zestawów. W takich przypadkach wartość modułu sprężystości taśmy uwzględnianego w obliczeniach drogi napinania jest korygowana na podstawie zależności przedstawionej w niniejszym artykule. Zastępczy moduł sprężystości taśmy powinien być uwzględniony w algorytmie obliczania długości skokuwózka napinającego, szczególnie dla przenośników, których złożony profil trasy może przyczynić się do lokalnego zmniejszenia sił w taśmie. W kolejnej części artykułu przedstawiono metodę konstruowania charakterystyk statycznych urządzeń napinających taśmę (Jabłoński, 1988), które wykorzystano do opisu stosowanych układów napinania taśmy. Spośród stosowanych urządzeń napinających przedstawiono rozwiązania ze stałym położeniem bębna napinającego podczas pracy przenośnika - tzw. sztywne urządzenia napinające oraz ze zmiennym położeniem bębna napinającego w czasie pracy przenośnika - grawitacyjne, hydrauliczne, automatyczne i nadążne. Na diagramach opisujących charakterystykę napinania, poza wymaganą wartością siły w taśmie zbiegającej z bębna napędowego, przedstawiono spodziewany przebieg jej zmiany w funkcji momentu napędowego, charakterystyczny dla danego typu urządzenia napinającego taśmę (Kulinowski, 2012). Podsumowanie artykułu stanowi przedstawienie propozycji wykorzystania charakterystyk statycznych urządzeń napinających do oceny pracy ciernego, bębnowego układu napędowego przenośnika taśmowego. Przedstawiona w artykule metoda obliczeniowa została weryfikowana poprzez badania przemysłowe i realizacje wielu złożonych projektów przenośników taśmowych uzupełnionych analizą wyników badań symulacyjnych dynamiki pracy modeli urządzeń napinających taśmę (Kulinowski, 2012).

  7. Analysis and Optimization of Driving Roller Shaft of Drawworks Conveyor with the Finite Element%JC-40绞车滚筒轴的有限元分析与优化

    Institute of Scientific and Technical Information of China (English)

    韩玉强

    2011-01-01

    The static analysis of driving pulley shaft of the drawworks convey was conducted by using the software of ANSYS10. 0. The nodal deformed shape and von Misses stress distribution figure of the shaft were obtained successfully and found the deformation and stress of maximum position, proposed the axis of the improvement plan. The result of analysis is close to the academic calculating. According to the results of analysis, strength check, rigidity check and stress-strain were calculated and the result indicated that it was accord with the regulation of API, Which indicates the result is valid. A theoretical reference for the structural optimization design of the shaft was provided.%采用有限元分析软件ANSYS10.0对JC-40绞车滚筒轴进行建模,并对轴上附件的质量和受力进行简化和静力学分析,得到了滚筒轴的节点变形云图和应力分布云图,找出变形及应力最大位置,提出轴的改进方案.滚筒轴的最大平均等效应力与解析法求解结果数值接近.根据有限元分析结果对滚筒轴的强度、应力和刚度进行校核,结果均能符合美国API的设计要求,表明该分析结果具有实际应用价值,可为大型传动滚筒轴的设计优化提供理论依据.

  8. 山钢集团3200m3高炉矿槽皮带上料最优控制%Optimised Bunker Charging Control for Belt Conveyor of shD Laiwu Steel Group Ltd.3200m3 BF

    Institute of Scientific and Technical Information of China (English)

    张林; 王庆光; 闫新宏

    2013-01-01

    Thesy stem adopts optimized type control,successfully realized 400m main charging belt driving,automatically proportioning below bunker,bunker weighing hopper of the mixed control ,feed flow simulating model,FIFO type burden profile control model,image identification,fault self detecting functions etc,Thus it is well worthy of promotion and application.%  本系统采用最优控制,成功实现了上料主皮带驱动、槽下自动配料、矿石称量斗的混装控制、仿真料流模型、FIFO式料型控制模型、图像识别、故障自诊断等功能,具有广泛的推广及应用价值。

  9. Removal of calcium carbonate precipitate by screw conveyor in nitrophosphate production%用螺旋输送机排除硝酸磷肥生产系统中的碳酸钙沉淀

    Institute of Scientific and Technical Information of China (English)

    薛继勇

    2002-01-01

    @@ 1碳酸钙过滤存在的问题 在硝酸磷肥生产中,用硝酸分解磷矿的酸解液经过酸不溶物分离、冷冻后,用真空双转鼓硝钙过滤机把Ca(NO3)2@4H2O从磷酸母液中分离出来.

  10. PLC技术在煤矿带式输送机中的设计与应用%Design and Application of PLC Technology in Coal Mine Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    朱霞清

    2013-01-01

    针对PLC技术在煤矿带式输送机中的设计与应用问题,对煤矿带式输送杌PLC技术控制系统功能进行了分析,提出了PLC控制系统应具备的功能,探讨了PLC技术在煤矿带式输送机中的应用,主要有调速型液力耦合器PLC控制、液体黏性软起动与PLC技术控制和下运盘式制动器与PLC技术.论述了PLC技术在煤矿带式输送机中的作用.

  11. DTL长距离弯曲带式输送机在选煤厂的应用%Application on DTL Long Bending Belt Conveyor in the Coal Preparation Plant

    Institute of Scientific and Technical Information of China (English)

    翟中朝

    2013-01-01

    DTL长距离弯曲带式输送机在斜沟煤矿选煤厂的成功应用,缩减了矸石在长距离运输过程中的转运环节.设备维护更加方便,降低了设备故障率,减少了设备的维护量.使工艺系统的布置更灵活、简捷、紧凑,便于生产管理.取得了直接和间接的经济效益,并在使用过程中取得了良好效果.通过对弯曲皮带输送机在该厂的成功应用进行研究,使该项技术在受地形制约及需长距离运输的选煤厂建设中得到广泛的应用.

  12. Thermal-structure Coupling Analysis of Disc Brake of Conveyor Belt%带式输送机盘式制动器热结构耦合分析

    Institute of Scientific and Technical Information of China (English)

    张杰; 李军霞

    2016-01-01

    揭示了盘式制动器的热结构耦合过程,分析了盘式制动器的热传导过程并建立了温度场的数学模型.利用Workbench有限元分析软件进行了制动过程的仿真和模拟,揭示了应力场、应变场以及温度场的分布情况与变化规律,并在不同的初始条件下做了对比分析,从而为盘式制动器的优化设计和改进提供了理论依据.

  13. 基于Pro/TOOLKIT二次开发技术的刮板输送机参数化建模%The Application Development of Pro/TOOLKIT for Parametric Modeling in Scraper Conveyor

    Institute of Scientific and Technical Information of China (English)

    毛君; 金宁

    2005-01-01

    Pro/TOOLKIT是Pro/ENGINEER自带的二次开发工具.介绍了基于Pro/TOOLKIT二次开发技术,以及应用在刮板输送机参数化建模的具体设计方法和基本步骤,说明了运用Pro/TOOL-KIT可以提高设计效率,缩短产品开发周期.

  14. Finite Element Analysis of Expanding Sleeve Connection of Belt Conveyor Based on COSMOS/Works%基于COSMOS/Works的带式输送机胀套联接的有限元分析

    Institute of Scientific and Technical Information of China (English)

    陆悌元; 郭永存; 胡坤

    2010-01-01

    胀套联接作为带式输送机中滚筒轴与轮毂之间的一种联接形式,具有其自身的优越性.通过建立胀套的有限元模型,利用COSMOS/Works插件的接触分析功能来检查胀套及其所联接的滚筒轴的应力和变形情况,从而选择合适的滚筒轴和确保其安装的精确性.并在此基础上比较胀套与其他联接的优缺点.

  15. 基于COSMOS/Works的带式输送机传动滚筒的有限元分析%Finite Element Analysis of Driving Drum of Belt Conveyor Based on COSMOS/Works

    Institute of Scientific and Technical Information of China (English)

    李晓丽; 袁圆

    2010-01-01

    对输送机传动滚筒受力状况做了理论分析,运用有限元分析软件COSMOS/Works对传动滚筒进行了静力分析,得出滚筒在载荷作用下的应力和变形分布规律.分析结果表明,该传动滚筒的结构设计完全满足其强度、刚度要求.

  16. Make selection for the position of the second head in double-drive-head belt conveyor%双机头驱动带式输送机第2机头位置的选定

    Institute of Scientific and Technical Information of China (English)

    石同利; 李军鸿

    2004-01-01

    根据煤矿平巷运输的生产实际,针对双机头驱动带式输送机第2机头位置选定的原则及计算方法进行了探讨,以运行阻力为计算依据,以输送带传动的欧拉公式为基本理论,以对阻力的合理分配为选定原则,介绍了2种确定方法,得出第2机头距机尾距离占运输全长35%的结论.

  17. NTS双吹瓶机气流传送带解决最复杂的装瓶(PET胶瓶)生产线%The NTS Dual- Blower Air Conveyor the Solution for the Most Complex PET Bottling Lines

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ 法国NTS双吹瓶机气流传送带的原理是:将胶瓶的机械自动定位功能和在瓶颈凸缘上下方分别鼓风两者结合起来,满足最复杂的装瓶(PET胶瓶)生产线的要求,因为这种生产线要求输送方式多样化,瓶子形状变化多,输送量大.

  18. Development of a machine for cleaning underground railway tracks and floor regions below belt conveyors installed next to the tracks; Entwicklung einer Maschine zur Reinigung von Gleisanlagen bis zur Schwellenoberkante, sowie unter Gurtfoerderern, die neben den Gleisanlagen installiert sind

    Energy Technology Data Exchange (ETDEWEB)

    Vogel, J. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Division

    2002-07-01

    Caked coal on underground railway tracks are a safety hazard. An experimental track cleaner was developed and constructed for fully mechanical removal of caked materials of varying composition and characteristics. These criteria, as well as specifications made by users, were listed in a catalogue used for assessing the available technological options. [German] Untertaegige Gleisanlagen werden durch Feinkohle oder durch hartnaeckige Anbackungen stark verschmutzt. Die Erfahrungen zeigen, dass Anbackungen auftreten koennen, die zu einem Sicherheitsrisiko werden, da die Schienenfahrzeuge statt auf ihrer Laufflaeche nur auf den Spurkraenzen abrollen, was zu Entgleisungen fuehren kann. Zur Mechanisierung der Gleisreinigung sollte im Rahmen des Entwicklungsvorhabens ein Versuchsgeraet zur Gleisreinigung konstruiert werden, welches in der Lage sein sollte, vollmechanisch Verunreinigungen mit wechselnden Verschmutzungskonsistenzen wirkungsvoll zu loesen, zu reinigen und abzufoerdern. Diese Kriterien, sowie Anforderungen von Anwenderseite flossen in ein Lastenheft, welches dazu notwendig war, bestehende Verfahren zu bewerten. (orig.)

  19. Ballast Water Treatment, U.S. Great Lakes Bulk Carrier Engineering and Cost Study. Volume 1: Present Conditions

    Science.gov (United States)

    2013-11-01

    ballast in 24 hours or less will have relatively low impact on current operations. The results also show that there are considerable operational...deck and into the deckhouse above the main deck; it consists of a loop- type elevating conveyor and boom conveyor (Figure A-3). The pilothouse is aft...the cargo flows onto a conveyor belt (one port and one starboard, that carry the cargo aft) dropping onto a single transverse belt, feeding the

  20. chute with the damping plate

    Directory of Open Access Journals (Sweden)

    V. Molnár

    2016-08-01

    in detail in three phases of shifting by means of a physical approach with the support of computing methods and simulation experiments with the transfer model. We can state that the direction and orientation of material impact have a direct influence on the conveyor's energy intensity. Thus, the inevitable condition for operation of arbitrary type of belt conveyor is to pay greater attention to the construction of the transfer model, particularly the intensity of the energy of the outgoing conveyor.

  1. Device for forming stacks of battery plates. Vorrichtung zur Bildung von Stapeln von Akkumulatorplatten

    Energy Technology Data Exchange (ETDEWEB)

    Krause, E.; Poesch, G.

    1988-01-14

    A device for forming stacks of a given number of battery plates continually supplied via a conveyor belt permits careful handling of the battery plates during the formation of stacks, by forming the stacks in the suspended state of the battery plates and dimensioning the stack by lifting the unnecessary battery plates over the conveyor conveying the other battery plates. The stacks formed in this way are lifted by conveyor belts and can be picked up by robust pickers.

  2. Mineral mining installation

    Energy Technology Data Exchange (ETDEWEB)

    Plevak, L.; Weirich, W.

    1982-04-20

    A longwall mineral mining installation has a longwall conveyor and a plurality of roof support units positioned side-by-side at the goaf side of the conveyor. The hydraulic appliances of the roof support units, such as their hydraulic props, hydraulic advance rams and hydraulic control valves, are supplied with pressurized hydraulic fluid from hydraulic supply lines which run along the goaf side of the conveyor. A plurality of flat, platelike intermediate members are provided at the goaf side of the conveyor. These intermediate members are formed with internal ducts for feeding the hydraulic fluid from the supply lines to the hydraulic appliances of the roof support units.

  3. 9 CFR 590.504 - General operating procedures.

    Science.gov (United States)

    2010-01-01

    ... processed, stored or handled. (h) Only germicides, insecticides, rodenticides, detergents, or wetting agents...) Utensils and equipment, except drying units, powder conveyors, sifters, blenders, and mechanical powder...

  4. On aspects of vibration of axially moving continua

    NARCIS (Netherlands)

    Hageraats-Ponomareva, S.

    2009-01-01

    In axially moving structures like conveyor belt systems, magnetic tapes, and so on, vibrations occur due to the presence of different kinds of imperfections in the systems. For these structures internal resonances can lead to severe vibrations. Resonance free conveyor belt systems can be constructed

  5. 40 CFR 63.7765 - What definitions apply to this subpart?

    Science.gov (United States)

    2010-07-01

    ... Air Act (CAA), in § 63.2, and in this section. Automated conveyor and pallet cooling line means any dedicated conveyor line or area used for cooling molds received from pouring stations. Automated shakeout... an electric current flowing through the arcs formed between the electrodes and the surface of the...

  6. 75 FR 10174 - Source-Specific Federal Implementation Plan for Navajo Generating Station; Navajo Nation

    Science.gov (United States)

    2010-03-05

    ... requirements. It would not be practical to specify these standards in the current rulemaking due to a lack of..., any conveyor belt transfer point, any pneumatic material transferring, any baghouse or other control... than 20% from any crusher, grinding mill, screening operation, belt conveyor, truck loading or...

  7. 75 FR 5009 - Proximity Detection Systems for Underground Mines

    Science.gov (United States)

    2010-02-01

    ..., feeders, loaders/muckers, track equipment, trucks, roof bolting machines, and mobile bridge conveyors... has auxiliary equipment, such as roof bolting machines and mobile bridge conveyors, attached to it... related to whether the current technology is able to accurately locate and protect workers from all...

  8. 40 CFR 63.11516 - What are my standards and management practices?

    Science.gov (United States)

    2010-07-01

    ... enclose dusty abrasive material storage areas and holding bins, seal chutes and conveyors that transport... enclose abrasive material storage areas and holding bins, seal chutes and conveyors that transport... listed in paragraphs (d)(6)(i) through (iii) of this section. (i) A list of all current personnel by name...

  9. 76 FR 336 - Intent To Prepare a Supplemental Environmental Impact Statement (SEIS) for PacRim Coal's Proposed...

    Science.gov (United States)

    2011-01-04

    ... 40,000 ton covered surge bin, overland conveyor loading station, roads, and a power distribution... life based on current estimated coal reserves. 2. A previous project design was evaluated in an EIS and... alternative discharge locations. In addition, the SEIS will evaluate mine access road and conveyor alignment...

  10. 76 FR 22152 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2011-04-20

    ... cables that supply 995-Volt 3 Phase AC current to Continuous Miners and Mobile Bridge Conveyors; and (2) trailing cables which supply 480-volt 3 phase AC current to Roof Bolters and Shuttle Cars. The cables will... standard to permit the use of extended trailing cables on Mobile Bridge Conveyors, Dual Boom Roof Bolters...

  11. 76 FR 54802 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2011-09-02

    ... 995-Volt 3-Phase AC Current to Continuous Miners and Mobile Bridge Conveyors. Cable will have a 90 degree insulation rating; and (2) trailing cables that supply 480-Volt 3-Phase AC Current to Roof Bolters... extended trailing cables on the Mobile Bridge Conveyors, Dual Boom Roof Bolters, Continuous Miners, and...

  12. 76 FR 59742 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2011-09-27

    ... not detected could result in misfires. (9) The current standard requires unnecessary risk of increased... in the Pocahontas No. 6 coal seam, where the seam height averages 42'' to 48'', and the conveyor belt...'' to 50'', and the conveyor belt is installed adjacent to the roadway with ventilation directed from...

  13. 77 FR 30283 - Standards of Performance for New Stationary Sources, National Emission Standards for Hazardous...

    Science.gov (United States)

    2012-05-22

    ... Landfill in Marquette, Michigan? A: EPA has determined Marquette Landfill's current design capacity must... approve a performance test (PT) waiver for installations of new quarry belt conveyors conveying sand with...? A1: Yes. EPA approves the PT waiver for installations of new quarry belt conveyors conveying the...

  14. Demonstration of Supervisory Control and Data Acquisition (SCADA) Virtualization Capability in the US Army Research Laboratory (ARL)/Sustaining Base Network Assurance Branch (SBNAB) US Army Cyber Analytics Laboratory (ACAL) SCADA Hardware Testbed

    Science.gov (United States)

    2015-05-01

    to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT...processing dashboard ........................................................8  Fig. 9  Main conveyor belt dashboard...Table B-5  Configuration and measurements for main conveyor belt PLC .....22  Table B-6  Configuration and measurements for packaging PLC

  15. 77 FR 20700 - Examinations of Work Areas in Underground Coal Mines for Violations of Mandatory Health or Safety...

    Science.gov (United States)

    2012-04-06

    ... other conditions, such as a misaligned conveyor belt, an operator might not consider these to be... adequately supported can quickly deteriorate and fall; stoppings can crush out and short-circuit air currents; conveyor belts can become misaligned or belt roller bearings can fail, resulting in an ignition source; and...

  16. 78 FR 59066 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2013-09-25

    ... approximately ten primary belt-conveyor drives and an average of sixty (60) sprays along each eight secondary... than the 300 ton per shift criteria using the hand-loading method. (8) Belt conveyor haulage is not... to other mine workings, which fluctuate considerably. (3) The vast majority of current underground...

  17. 78 FR 29384 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2013-05-20

    ... sprinkler system for its conveyor belts. The petitioner proposes the following alternative for best... designed to stop the running conveyor belt when a water sprinkler is activated. 9. Each automatic sprinkler.... The over current relay setting may be increased up to 100 percent above its normal setting. (9) During...

  18. 76 FR 51879 - Definition of Solid Waste Disposal Facilities for Tax-Exempt Bond Purposes

    Science.gov (United States)

    2011-08-19

    ... Process. (i) Company I owns a paper mill. At the mill, logs from nearby timber operations are processed... sorted from the conveyor belt by a sorting machine immediately before the stripped bark arrives at the storage bin. Fifty-five percent of the costs of the conveyor belt and the sorting machine are allocable...

  19. 30 CFR 14.8 - Quality assurance.

    Science.gov (United States)

    2010-07-01

    ... document. If a third party is assembling or manufacturing all or part of an approved belt, the approval... MINING PRODUCTS REQUIREMENTS FOR THE APPROVAL OF FLAME-RESISTANT CONVEYOR BELTS General Provisions § 14.8... order to assure that the finished conveyor belt will meet the flame-resistance test— (1) Flame test...

  20. Rocking rollers

    NARCIS (Netherlands)

    Van Kasteren, J.

    2003-01-01

    The weight of people and luggage makes the conveyor belts at Schiphol Airport sag a little, causing extra wear to both the plastic guide rollers and the rubber conveyor belt itself. Together with Karel Drenth, Gabriel Lodewijks, Professor of Transport Engineering & Logistics at Delft University of

  1. On aspects of vibration of axially moving continua

    NARCIS (Netherlands)

    Hageraats-Ponomareva, S.

    2009-01-01

    In axially moving structures like conveyor belt systems, magnetic tapes, and so on, vibrations occur due to the presence of different kinds of imperfections in the systems. For these structures internal resonances can lead to severe vibrations. Resonance free conveyor belt systems can be constructed

  2. Breathing of new life.. Rebuild of a CAT 589 pipelayer in the opencast mining Garzweiler; Neues Leben eingehaucht.. Rebuild eines CAT 589 Rohrverlegers im Tagebau Garzweiler

    Energy Technology Data Exchange (ETDEWEB)

    Plonczynski, Guenter; Sterken, Heinz-Josef [RWE Power Aktiengesellschaft, Grevenbroich (Germany). Tagebau Garzweiler

    2011-06-15

    Worldwide there are pipelayers at those sites where water pipelines, oil pipelines and gas pipelines are laid. In Germany, pipelayers mainly are used at RWE Power as well as in the opencast mines of the Rhenish mining area. Pipelayers are suitable for moving conveyor systems and for changing of conveyor belts.

  3. Robustness of multiple equilibria in the global ocean circulation

    NARCIS (Netherlands)

    Huisman, S.E.; Dijkstra, H.A.; von der Heydt, A.S.; de Ruijter, W.P.M.

    2009-01-01

    In an idealized Atlantic-Pacific ocean model we study the steady state solutions versus freshwater input in the northern North Atlantic. We find that four different states, the Conveyor (C), the Southern Sinking (SS), the Northern Sinking (NS) and the Inverse Conveyor (IC), appear as two disconnecte

  4. Changes in pig diet particle size profile and nutrient content during on-farm storage and distribution to the feeders.

    Science.gov (United States)

    Cools, An; Maes, Dominiek; Du Laing, Gijs; Janssens, Geert P J

    2014-01-01

    The present study assessed the effect of silo emptying and feed transport by conveyor systems on particle size and nutrient content of the feed delivered to the pigs. Experiment 1 sampled feed from four feeders along the conveyor system of two barns. Samples were taken immediately after filling the feed silo (Begin) and when the silo was almost empty (End). In Experiment 2, three barns with drag-type conveyors, three with auger-type conveyors and two with spiral-type conveyors were sampled. Along the different conveyors, samples at 10, 20, 50 and 85 m distance from the feed silo were taken from the feeders. In each barn, sampling was repeated for two subsequent batches of feed delivered. In all samples, particle size profile was determined and nutrient content was analysed. In Experiment 2, mineral content was also determined. In Experiment 1, the size of the different particle fractions decreased from Begin to End. An interaction (p conveyor type was detected for the 10% smallest particles. In Experiment 2, an effect of sampling time on the 10% largest particles was detected (p < 0.05). The effect of sampling time on several nutrients was observed in Experiments 1 and 2, but the affected nutrients differed between both experiments. Results implied that it was mainly emptying of the silo that affected mash particle size profile and nutrient content. The potential impact of these changes on pig performance requires further investigation.

  5. Phthalates in soft PVC products used in food production equipment and in other food contact materials on the Danish and the Nordic Market 2013-2014

    DEFF Research Database (Denmark)

    Petersen, Jens Højslev; Jensen, Lisbeth Krüger

    2016-01-01

    to food type, contact temperature and time in contact with food. In both recent control campaigns about 1/3 of the samples analysed exceeded the current maximum limits for phthalates (especially DBP and DEHP) in plastics or showed migration into the fatty food simulant above the specific migration limits....... Critical sample types were conveyor belts, hoses and gloves. Conclusions Legal limits for phthalates were exceeded in many of the samples analysed in recent tests, including a large proportion of conveyor belts and gloves. The proportion of non-compliant conveyor belts, hoses and gaskets was lower in 2013...

  6. Enhancing the safety and efficiency of the driving gear of coal mining machinery by using water as a hydraulic fluid and enhancing the reliability of scraper-chain conveyors; Erhoehung der Sicherheit und Leistungsfaehigkeit der Antriebstechnik von Arbeitsmaschinen durch Verwendung von Wasserhydraulik sowie Erhoehung der Zuverlaessigkeit der Kettenkratzerfoerderer

    Energy Technology Data Exchange (ETDEWEB)

    Reichel, J.; Boeing, R.; Graetz, A.; Loehning, H.D.; Plum, D.

    1997-12-31

    The objective pursued is to increasingly use water or high water-content fluids as a substitute for other hydraulic fluids in driving gear of mining machinery. The state of the art of the technology is represented only by individual solutions achieved for given purposes which are not suitable for other applications, let alone for coal mining machinery. The research project was to identify hydraulic components that will permit the use of water or watery substances as a hydraulic fluid in mining applications. The components have been found and further developed, and finally systems with linear and rotatory drives have been tested at various test facilities in order to derive information on the system behaviour of pressurized fluids and machinery components and their suitability for coal mining applications. (orig./CB) [Deutsch] In der untertaegigen Antriebstechnik sollen vermehrt Wasser und wasserhaltige Fluessigkeiten eingesetzt werden. Der Stand der Technik fuehrt bei der Anwendung von Wasserhydraulik immer wieder nur Einzelloesungen auf, die nicht allgemein und insbesondere im Steinkohlenbergbau angewendet werden koennen. Im Rahmen dieses Forschungsvorhabens wurden fuer die Wasserhydraulik geeignete Komponenten untersucht, weiterentwickelt und schliesslich Systeme mit linearen und rotatorischen Antrieben auf verschiedenen Pruefstaenden erprobt, um Aussagen ueber das Systemverhalten von Druckfluessigkeit und Bauelementen fuer Bergbauanwendungen zu bekommen. (orig./MSK)

  7. Requerimientos tecnológicos del transportador de laterita hacia el molino de bolas, de la Empresa Productora de Níquel Comandante Ernesto Guevara; Technological Requirements of the Conveyor Belt which Carries Laterite to the Balls Mill in Nickel Producer

    Directory of Open Access Journals (Sweden)

    Javier Muñoz Álvarez

    2011-02-01

    Full Text Available Se describe el flujo productivo existente en la Empresa Productora del Níquel Comandante Ernesto Guevara,hasta la etapa de la molienda seca, con énfasis en los detalles técnicos de mayor relevancia en el proceso.Se analiza la influencia de la cantidad de mineral en el sistema sobre el comportamiento energético de lamolienda. Finalmente se determinan los requerimientos tecnológicos impuestos por el transportador delaterita 215 - TR - 201 al accionamiento eléctrico, en función de las características y las necesidades delproceso. In the paper, the productive flow existing in the nickel producer enterprise Commandant Ernesto Guevarawas described until the stage of dry milling, with an emphasis on the technical details of greater relevancy inthe process. There was analyzed the influence of the amount of mineral in the system over the energyconsumption performance of the milling. Finally it were identified the technological requirements imposed bythe 215 - TR - 201 laterite carrier to the electric drive, according to the characteristics and needs of theprocess.

  8. 50 CFR 660.314 - Groundfish observer program.

    Science.gov (United States)

    2010-10-01

    ... certified mail at the observer's most current address provided to NMFS. The IAD will identify whether a...) Diverter board aboard at-sea processing vessels. The conveyor belt conveying unsorted catch must have a...

  9. 50 CFR 600.504 - Facilitation of enforcement.

    Science.gov (United States)

    2010-10-01

    ... records, and an accurate hold plan reflecting the current structure of the vessel's storage and factory... not limited to, portable conveyors, exhaust fans, ladders, nets, fuel bladders, extra bin boards, or...

  10. 50 CFR 679.28 - Equipment and operational requirements.

    Science.gov (United States)

    2010-10-01

    ... catcher/processors using trawl gear. The conveyor belt conveying unsorted catch must have a removable...). The vessel owner must maintain a current observer sampling station inspection report on board the...

  11. 40 CFR 270.42 - Permit modification at the request of the permittee.

    Science.gov (United States)

    2010-07-01

    ... changes that keep the permit current with routine changes to the facility or its operation. These changes..., valves, pumps, conveyors, controls) 1 4. Changes in the frequency of or procedures for monitoring...

  12. 75 FR 36121 - Proposed Information Collection Request Submitted for Public Comment and Recommendations; Safety...

    Science.gov (United States)

    2010-06-24

    ... the use of the conveyor belt entry as a ventilation intake to course fresh air to working sections and... view documents supporting the Federal Register Notice. III. Current Actions This request for collection...

  13. 29 CFR 1926.408 - Special systems.

    Science.gov (United States)

    2010-07-01

    ... means which are not designed to interrupt the load current of the circuit shall be either interlocked..., pumps, conveyors, and underground excavators. (ii) Conductors. Conductors in tunnels shall be installed...

  14. 50 CFR 300.118 - Facilitation of enforcement and inspection.

    Science.gov (United States)

    2010-10-01

    ... accurate hold plan reflecting the current structure of the vessel's storage and factory spaces. (3) Before... of the vessel. Non-resource items include, but are not limited to, portable conveyors, exhaust fans...

  15. 77 FR 38769 - 97th Annual Meeting of the National Conference on Weights and Measures

    Science.gov (United States)

    2012-06-29

    ..., Belt-Conveyor Scale Systems The Committee will consider a proposal to add language to NIST Handbook 44... Price This proposal would modify device specifications to recognize current marketing practices of...

  16. Modeling of Modern Active Devices for Simulations of Analog Circuits in PSpice

    Directory of Open Access Journals (Sweden)

    T. Dostal

    2000-09-01

    Full Text Available Suitable models of the modern active components and functional blocks,namely new types of current conveyors, operational and transimpedanceamplifiers, in several appropriate levels, using analog behavioralmodeling are given in this paper.

  17. 40 CFR 63.1103 - Source category-specific applicability, definitions, and requirements.

    Science.gov (United States)

    2010-07-01

    ... allow worker access; passage of material into or out of the enclosure by conveyor, vehicles, or other... vessel. You also must load hydrogen fluoride into only tank trucks and railcars that have a current...

  18. 77 FR 58531 - Notice of Intent To Prepare a Joint Environmental Impact Statement (EIS) for the Gateway Pacific...

    Science.gov (United States)

    2012-09-21

    ... loop. A system of conveyors would connect the commodity storage areas to the trestle and wharf. The... interested parties are encouraged to respond to this notice and provide a current address if they wish to be...

  19. 77 FR 810 - Petitions for Modification of Application of Existing Mandatory Safety Standards

    Science.gov (United States)

    2012-01-06

    ... hand-loading method. (8) Belt conveyor haulage is not used in this underground mine for section/main... to other mine workings, which fluctuate considerably. (3) The vast majority of current underground...

  20. 75 FR 18875 - Notice of Intent To Prepare an Environmental Impact Statement for the Proposed Dairy Syncline...

    Science.gov (United States)

    2010-04-13

    ... leased areas), appropriate land use authorizations on leased lands, and an amendment to the current... with mitigation and land exchange; use of conveyors to transport ore to the existing mill; revising the...

  1. 77 FR 38087 - Agency Information Collection Activities; Submission for OMB Review; Comment Request...

    Science.gov (United States)

    2012-06-26

    ..., conveyors, trucks, loaders, and other heavy-duty equipment for the excavation, haulage, and processing of... approval for this information collection under OMB Control Number 1219-0120. The current OMB approval is...

  2. 77 FR 16865 - Proposed Extension of Existing Information Collection; Occupational Noise Exposure

    Science.gov (United States)

    2012-03-22

    ... mechanized industry, relies on drills, crushers, compressors, conveyors, trucks, loaders, and other heavy... CONTACT section of this notice. III. Current Actions The information obtained from mine operators is used...

  3. 77 FR 17098 - Proposed Extension of Existing Information Collection; Independent Contractor Registration and...

    Science.gov (United States)

    2012-03-23

    ... equipment, or constructing new buildings or new facilities, such as shafts, hoists, conveyors, or kilns... person listed in the FOR FURTHER INFORMATION CONTACT section of this notice. III. Current Actions The...

  4. 40 CFR 141.602 - System specific studies.

    Science.gov (United States)

    2010-07-01

    ..., major demand areas, pumps, and control valves, or are known or expected to be significant conveyors of... valves. (C) The model must be calibrated, or have calibration plans, for the current configuration of the...

  5. 77 FR 38832 - Agency Information Collection Activities; Submission for OMB Review; Comment Request; Marine...

    Science.gov (United States)

    2012-06-29

    ... such as conveyors and industrial trucks. The information the OSHA requires from employers are necessary... under Control Number 1218-0196. The current OMB approval is scheduled to expire on June 30, 2012...

  6. 29 CFR 570.71 - Occupations involved in agriculture.

    Science.gov (United States)

    2010-07-01

    ..., potato digger, or mobile pea viner; (ii) Feed grinder, crop dryer, forage blower, auger conveyor, or the... definitions contained in the current edition of Agricultural Engineering, a dictionary and handbook...

  7. 9 CFR 381.76 - Post-mortem inspection, when required; extent; traditional, Streamlined Inspection System (SIS...

    Science.gov (United States)

    2010-01-01

    ... current test minus the tolerance, with the condition that the resulting CUSUM cannot go below zero. (b... conveyor line. The space shall be level and protected from all traffic and overhead obstructions. (2) A...

  8. 30 CFR 75.820 - Electrical work; troubleshooting and testing.

    Science.gov (United States)

    2010-07-01

    ... voltages and currents; and (3) By persons qualified to perform electrical work and who wear protective... accordance with paragraph (b) of this section. (f) Prior to the installation or removal of conveyor belt...

  9. 78 FR 52967 - Notice of Intent To Initiate Public Scoping and Prepare an Environmental Impact Statement for...

    Science.gov (United States)

    2013-08-27

    ... existing Rosebud Mine and extend mine life by an estimated 19 years. Current land uses include grazing land... conveyor to the Colstrip Steam Electric Station. Coal with higher sulfur content (an estimated 105,000 tons...

  10. 75 FR 47905 - Cranes and Derricks in Construction

    Science.gov (United States)

    2010-08-09

    ..., Elevators, and Conveyors,'' was originally adopted through this process. The section of subpart N of 29 CFR... Committee helped them to develop revisions to the current subpart N requirements. C-DAC was chaired by a...

  11. 40 CFR 63.803 - Work practice standards.

    Science.gov (United States)

    2010-07-01

    ... implementation plan. The training program shall include, at a minimum, the following: (1) A list of all current... containing more than 8.0 percent by weight of VOC for cleaning spray booth components other than conveyors...

  12. 77 FR 29336 - Agency Information Collection Activities; Submission to OMB for Review and Approval; Comment...

    Science.gov (United States)

    2012-05-17

    ... operation, bucket elevator, belt conveyor, bagging operation, storage bin, and enclosed truck or railcar... the 2009 ICR amendments, which corresponds to the third year of this renewal. Beginning in the...

  13. A contribution to problems of clean transport of bulk materials

    Directory of Open Access Journals (Sweden)

    Fedora Jaroslav

    1996-03-01

    Full Text Available The lecture analyses the problem of development of the pipe conveyor with a rubber belt, the facitities of its application in the practice and environmental aspects resulting from its application. The pipe conveyor is a new perspective transport system. It enables ransporting bulk materials (coal, crushed, rock, coke, plant ash, fertilisers, limestones, time in a specific operations (power plants, heating plants.cellulose, salt, sugar, wheat and other materials with a minimum effect on the environment. The transported material is enclosed in the pipeline so that there is no escape of dust, smell or of the transported material itself. The lecture is aimed at: - the short description of the operating principle and design of the pipe conveyor which was developed in the firm Matador Púchov in cooperation with the firm TEDO, - the analysis of experiencie in working some pipe conveyors which were under operation for a certain

  14. 30 CFR 75.333 - Ventilation controls.

    Science.gov (United States)

    2010-07-01

    ... point of travel of the dolly or 600 feet from the point of deepest penetration in the conveyor belt... haulage system shall be the outby most point of travel of the dolly or 600 feet from the point of...

  15. 40 CFR 63.1445 - What work practice standards must I meet for my fugitive dust sources?

    Science.gov (United States)

    2010-07-01

    ... include, but are not limited to, transfer of material from one conveyor belt to another and transfer of... transporting bulk quantities of fugitive dust materials. Paved roads and parking areas that are not used by...

  16. 36 CFR 251.53 - Authorities.

    Science.gov (United States)

    2010-07-01

    ... structures and facilities for recreation, public convenience, or safety; (ii) industrial or commercial..., flumes, laterals, pipes, pipelines, tunnels, and other facilities and systems for the impoundment... facilities in connection therewith; (3) Pipelines, slurry and emulsion systems, and conveyor belts...

  17. 30 CFR 817.57 - Hydrologic balance: Surface activities in or adjacent to perennial or intermittent streams.

    Science.gov (United States)

    2010-07-01

    ... PERMANENT PROGRAM PERFORMANCE STANDARDS-UNDERGROUND MINING ACTIVITIES § 817.57 Hydrologic balance: Surface... by roads, railroads, conveyors, pipelines, utilities, or similar facilities. You must comply with all...

  18. Understanding Chemical Sensitivity and Surface Response in Detecting Trace Levels of Explosives Using Vibrational Sum Frequency Spectroscopy

    Science.gov (United States)

    2013-11-04

    the research conducted for our current ONR-CIED project focused in part on determining whether commonly encountered explosives have nonlinear optical...of urea that were moving on a baggage conveyor past the interrogation region. The speed of the conveyor belt was 0.5 m s−1 and given the...collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT

  19. Pharmacy Automation in Navy Medicine: A Study of Naval Medical Center San Diego

    Science.gov (United States)

    2015-09-01

    places an order, the conveyor system directs each prescription through the different steps of the fill process. Manual fill stations are located to...performing all steps, including transportation, up to pharmacist verification via the conveyer belt. Manual fills are located along the conveyor system...healthcare facilities continue to seek ways to reduce cost and improve efficiency; the pharmacy is one of many avenues to accomplish this task. The current

  20. System to Repair Deformations in Elastomeric Hoses

    Science.gov (United States)

    2017-01-05

    housing having an interior housing Attorney Docket No. 300172 4 of 21 chamber and open on each longitudinal end. An endless conveyor transports the...under the conveyor and is partially filled with heating water so that the articles are partially immersed in the water as they are transported through...trough 20 to prevent damage to hose 12 where hose 12 enters and exits trough 20. Trough 20 is filled with a heated liquid 24. The current